Yes, but in each instance of school shootings, there was bullying, exclusion, and/or isolation. Also, despite the media attention given to mass shootings, they are statistically rare albeit blown out of proportion to actual causes of untimely deaths. [washingtonpost.com]

@dahermit There have been 307 mass shootings in the US so far in 2018.
If you are comfortable with this, I am very glad to let you know you are in the minority.
[amp.businessinsider.com]

@CallMeDave If you review you link, seems to list "mass shootings" as any shooting that had more than one victim. It seems to play fast and loose with that definition. Stating that whether or not I am "...comfortable with this..." suggests an element of emotion rather than an evaluation of the factors of the situation logically and dispassionately. While emotional posts likely meet the criteria for "social interaction" (A.K.A., "social media" ), as a high-functioning Asperger's person, I see it as a waste of time. Therefore, I am going to block you as being too emotional to contribute to a logical discussion.

You are introducing a Straw Man Fallacy into the argument...Nevertheless, when I was a kid in the sixties, there were almost no mass shootings in the U.S. despite the high per capita gun ownership. In fact, guns were routinely brought to school for demonstrations in speech classes, and to be worked on in shop classes. Mass shootings are a modern phenomenon and given the lack of such shootings years ago, casts doubt as to your perceived causation between the number of guns and shootings. Consider if you wish, the correlation between excessive publication of such shootings via traditional media and social media. One of the very first school massacres was in Bath, Michigan. But, I am sure you never heard of it, the reason being it was not reported in a histrionic manner, with it making the news for days, publicized candle light vigils, etc. In short, it was never copied.
Also, the fact that there are way more gun murders in the countries of Central and South America than in the U.S., weakens your implied correlation between per capita gun ownership and gun deaths inasmuch as the citizens of thoes countries have a low per capita gun ownership but a very high gun murder rate. Note however, that those countries have a very low standard of living.

@dahermit the gun-ownership rate in the 6AM 's was so far below what it is now as go be on different planets, and other than law enforcement, mostly hunters and a few hobby shooters with proper training & respect for their power. You are comparing apples to oranges, at best.
What country(s) in South America are you referring to? And how does a high-per-capita murder rate translate to our quasi-miliitia doomsday cults? I'll wait right here to see how you do that, shall i?

@AnneWimsey"the gun-ownership rate in the 6AM 's was so far below what it is now as go be on different planets..." No, you are wrong...the per capita rate has been fairly stable: as you will see in this link:

[statista.com]

"... and other than law enforcement, mostly hunters and a few hobby shooters with proper training & respect for their power. You are comparing apples to oranges, at best." I have no idea what you are talking about. However, I will suppose that you are trying to convey what is in the minds of gun owners and that of course is impossible. You are in no way capable of speaking for the gun community.

"What country(s) in South America are you referring to?"
List_of_countries_by_intentional_homicide_rate

"And how does a high-per-capita murder rate translate to our quasi-miliitia doomsday cults? I'll wait right here to see how you do that, shall i?" You seem to be expanding the argument to the ridiculous. My argument was that there is likely a connection between poverty and gun violence. Nothing about "quasi-militia doomsday cults" It has become obvious that you cannot conduct a dispassionate, logical debate. Therefore, I will give you time to read this response and then block you so I do not have to put up with your emotional rants...you do not have a tidy mind.