Warning: this article is Canadian satire but it really outlines how it's confusing the media.
[thebeaverton.com]

It is hard to address all the nuts out there and their reasoning for doing anything!Perhaps if we had more mental aide facilities we might prevent some of these problems

"How are these men getting so confused about intent of women and sexuality?" Early psychological development without mature (in a truly psychological perspective) guidance. "Why are there groups out on line that promote this attitude?" Our technological advancements assist in the disturbed, distorted, warped, personalities finding each other and gaining a sense of belonging and affirming their twisted ideas. "What can be done about this?" This is really tough to answer. There is safety in numbers. Don't walk alone. Have eyes in back of your head (be swivel headed when walking). Maybe find the Incel group website and watch for members in your area. Since they hate "Chads" as well as "Stacys", exposing them might enrage them to retaliate. I don't know.

A little shout out to all the women here: None of you are smearing all men as misogynists. No generalizations. Kudos to non-believers and this website! We can hold civilized conversations.

We all experience rejection of one kind or an other and from various groups of people. How one processes such things exposes ones sanity and personality.

In short, that guy had a mental problem. Don't make it yours.

Other than that, free access to quality mental health care would be a very good thing.

It is disturbing. Some people are literally crazy. The causes are many and complex - not easily fixed.

Look at who is in the White House... He ran on racist misogyny and gives tacit approval to this sort of behavior. He clearly believes that women are property and somehow worth less than men. Toys to play with; "grab 'em by the pussy" and, "I just start kissing them". He belongs to the minority of people, both men and women, who voted for and still support him. He endorsed Roy Moore. I can't believe anyone voted for him and, frankly, women who voted for him are part of the problem.

We need to get his sorry ass out of office.

nothing. People that are unhinged do unhinged things. We don't give them more attention than we have to and move on. They thrive on attention.

Well, then, we must teach a course on "Why men are rejected".
The topics to be develop are:

1. I am a nice man so women shouldn't reject me.

2. I wear my lunch on top of my belt but women shouldn't reject me.

3. My dentist needs to re-study "How to make fitting dentures so I don't spit on the lady I am talking to"...but women shouldn't reject me.

4. I shouldn't take the only three hair left over on my scalp and bring them over my forehead -fan shape- and I shouldn't glue them to prevent the air blowing them out of place....but women shouldn't reject me.

5. Although accidents happens, the flatulence shouldn't shoot out of my ass...e at the speed of the light....shouldn't smell too bad either....but women shouldn't reject me.

6. I shouldn't tell her that her schooling was a waste of time since she was only supposed to marry and to have five kids....but she shouldn't reject me.

7. I shouldn't make negative comments about equal pay for equal job....but she shouldn't reject me.

8. I shouldn't say things such as "Many women get high paying salaries because they f...k their bosses....but women shouldn't reject me.

9. I shouldn't say that women with kids are not the best ones to marry...and that my kids are adorable...but she shouldn't reject me.

10. I am the youngest of five boys and my mother's favorite...but women shouldn't reject me...

I have been single for a long time; and I'll admit, sometimes I get so lonely that it physically hurts in my chest. But I would never blame others for this- no one else has a responsibility to like me, or be kind, let alone love me.
There are groups - of men, and of women, who's feelings of entitlement know no bounds. These people are selfish beyond reason. This happens with romance (or lack thereof), religion, race, economic standing, in some form or another.

Yea, I get lonely. I get sad sometimes. But anger? Anger against people I don't even know? I just don't understand. And I won't live my life that way.

I don't know how men get to this state, it is most likely some kind of groupthink, or they've been rejected by their mothers; I just can't imagine what could drive them to such perverted thinking, and then to follow it up with a horrific and grotesque act as this person did.

Something vital to human nature is missing from their psyches; they are in some way incomplete as humans. I wouldn't know where to begin to address this problem. They must feel entitled, somehow, to have female companionship or servitude...I just don't know. Yes, it's horriby disturbing.

I just read a Vice article about it: framed "toxic masculinity" as a social problem. Scary stuff.

I don't know

Yes the group is called Incel. here is an article linking the cowardly killing to this group.
[nytimes.com]
I personally have been getting tons of flashback to the École Polytechnique massacre in 1989 that also very mysogynistic in nature. Back then it was blamed as a muslim hate crime against women.
[en.wikipedia.org]
There's a big f&?% cynical feeling around this story where white supremecist are dissawoving themselves from the Incel group. Very disturbing.
All of this is very disturbing to me (as a man).

Ya Grace someone posted on this today with a link to the group-pretty disgusting group. Sexual prowess group seeing women as sexual objects only.

Some men seem to think that a woman's body is rightfully theirs if they do something nice for her. Some think that all they have to do is be nice to a woman X number of times and she owes him sex. I don't know where this type of thinking comes from. Deeply ingrained misogyny maybe?

Who in the hell hates women. How would you get to that point even if you were teased/bullied by oene. For the love of God (substitute Eros)

I have been reading about this, too, and it's terrifying.

Well it's disordered thinking in any case because to my knowledge there's no way to drive through a crowd of pedestrians and only kill women. So I'm having none of him hiding behind some misogynist ideology. He's just using it as an excuse for his general feelings of rage and impotence.

As to how some men might be confused about this, I don't know, I suppose it has something to do with unrealistic expectations engendered by 11th century notions of romance and courtly love that we still try to make work after a thousand years of abject failure. Combined with a strong tendency to patriarchy such that the expectations and hopes of men are way more important than any that women might have in the other direction.

If you believe that women are ethereal perfect creatures who need your protection and then find that they don't appreciate being infantalized and are less than perfect, yeah, that might anger less stable people.