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All of this is factually incorrect.
Unless you interpret a Hallowe'en costume (i.e., something that comes with the message that this is a scary person not to be idolized) as "cosplay" (https://www.msn.com/en-us/tv/celebrity/tyler-robinsons-chill...), the primary suspect (out of respect to the justice system, I must continue to admit the possibility that they got the wrong guy, until the trial has concluded) did nothing of the sort. (Aside from which, he would have been 14 at the time.) Apparently some people are circulating images of him in a MAGA shirt, but these are photoshopped (https://leadstories.com/hoax-alert/2025/09/fact-check-tyler-...). There were Antifa slogans and memes on the bullets and the shooter targeted a conservative, and he is known to have opposed Kirk ideologically (https://www.nbcchicago.com/news/hey-fascist-catch-messages-w...). He is very obviously not a "MAGA Republican".
Charlie Kirk's last words were to ask for a clarification, arguably in a pointed way, intended to imply that gang violence should be counted as mass shooting when it otherwise meets the definition. Even if you take a logical leap based on the statistics showing that the perpetrators of such violence are generally non-white, there is nothing racist about pointing this out. The statistics are what they are, and saying so does not attribute the conduct to non-white people in general. If claims like this are made off-limits then it becomes impossible to discuss a real problem that results in many deaths.
My guess is he's a terminally-online gamer/channer/Groyper and he was trying to troll news organizations into broadcasting his spicy memes. But this is just my guess, and until we get more evidence, my guess is worth about as much as your "antifa" theory, i.e., zilch.
It comes across to me like you're ignoring a plain reading of the evidence in favour of one that refers to an even more cryptic group. (There are also other comments in the discussion arguing that this group disdains political violence.)
The plain evidence is that each etching is a reference to an extremely online/gamer meme, not leftist slogans.
https://helldivers.fandom.com/wiki/Terminids
But you're missing my point, which is that it's too early to speculate. Pundits were blaming trans people and leftists before the bullets were even found.