Because trump and white supremacists are the democrats target and it is politically judicious to try and make trump look bad.
This is not to defend trump - but to point out the stupidity of such an easily diverted and defended attack Trump has only to point to the facts above and state the obvious, few coloured people are white supremacists

It is people who feel disenchanted with their life who go out and kill in this way - that feeling has many root causes. - but if none had access to guns, their effect would be less.

Maybe because of the manifestos they leave behind.

The awful painful fact is that human beings are dead because other humans shot them. Usually when people do this it is because they have lost loci of control and feel disenfranchaised. Sometimes the mass killings are a well documented form of self harm or suicide. (Killing loved ones or knowing you will be killed by acting thus) Sometimes young men, usually white, virtually always men become overwhelmed by their experiences, misinterpret news stories or look for confirmation bias in certain situations. If this is confirmed by certain individuals, particularly in positions of power and influence, these young men believe they have permission to act in extremely violent ways. We have the same young men in UK. The difference is one thing and one thing only...we don't have guns.

This link provides a list of the mass shootings since 1982 in the USA that stemmed from "rampages" and excludes gang violence and other crime related shootings. It just lists the incidents where 3 or more people were killed, so that leaves out any cases where many people were injured but less than 3 people died.
[motherjones.com]

The table has a column that lists the race of the shooter and it shows that:
65 of the 114 shooters were White (all but one were Male)
42 of 62 shooters who killed six or more people were White (1 was female)
23 of 35 shooters who killed eight or more people were White
8 of 10 shooters who killed 15 or more people were White (the Orlando and Virginia Tech shooters were not white).

Below is a table that provides a complete summary.

There have been 250 mass shootings so far. Why are there only 98 in this picture?

Snopes has done a fairly comprehensive investigation into this claim - [snopes.com]

Most shootings by black/coloured shooters are gang related and their victims are from the same background. If you deduct them from the above gallery, you will be left with the white supremacists and just generally disgruntled whites with a chip on their shoulders. There is evidence that the latest shooter was indeed a white supremacist because he left his manifesto on the Internet. It isn’t liberals who are asserting this, it’s law enforcement agencies.

The El Paso shooter wrote a manifesto that used all the common phrases used by Trump tweets. He used better spelling and grammer than Trump. Go figure.

I'd like to see what this meme would look like if the bar was raised to ten people or more, with or without a manifesto. Sadly, it isn't all that uncommon for the mass murder to be a disgruntled employee. BTW, what's a gruntled employee? The one without the gun?

Absent: women, unless they're that ugly looking.

Please cite your source, I could only find your poster on Truly Times and 4chan. I like to make sure info comes from reliable sources, just like an essay in school. This would fail as evidence to be used to prove your point in any high school assignment.

They're 3 or more types of mass killings. It depends on motive. For example, gang violence, hate, personal reasons, just plain loonies. What I find Unfortunate about this post is the division between "liberals" & "white supremacists." Are you saying by your definition that "conservatives" welcome "white supremacists" into their fold? What does that have to do with "conservative" principles, at least the one's I understand.

I agree with this argument. There are all kinds of shooters, not just white - let alone white supremacists.

Excellent point! But the PCers on here will give you hell for it!

Because they’re doing some of them? /thread

What about the shooters that were killed instead of arrested? How does the makeup look as you raise the kill count to a higher number?