It does smell like a ploy to get the normie vidya gaems and streamer crowds to turn against the 2A. I watch a handful of Twitch streamers often, including a few who pull in a few thousand viewers a session, and they largely remain apolitical for very good reason. So if in the coming weeks we start to see streamers/e-celebs trying to push any semblance of gun control, then it's MKultra mission success.
Luckily I've only seen these kneejerk responses coming from gaming venues who want to screen guests. Annoying on its own, but many of the ones I've been to already do bag checks/metal detectors so it's a moot point. And some YouTubers are standing firm that the shooter David Katz already had screws loose in his head, whereas others (particularly ones from outside the USA) are immediately going to the "ermagerd ban 2A control ur guns murrica" confirmation bias.