Aside from the usual handwringing crap that occurs every time there is a shooting, guns are not that much of a hot button topic right now, so I have no idea why John decided to step into a minefield like this.
Even more bizarre, he was PRO-gun for quite some time even after picking up identity politics.
Weirdest of all is that John has to be aware on some level the internet is just waiting for him to make an ass of himself yet again so the wider world outside his bubble can point and laugh at him while BTFOing him with his own ignorance, so unless he's such a narc even getting obscenely embarrassed because of manifest displays of stupidity is preferable to being ignored, this whole gun sperging incident is just odd to say the least.