Most school shooters don't give a shit about gun rights, they're just a convenient tool to exact "just punishment" on whatever people they hate. And boy oh boy are you full of hate.
As for your twitter ban, I'm very very sure you got banned from that particular cesspool for repeatedly breaking their rules by demanding the brutalizing and killing of various people. Whoever you blame for reporting your blatant rulebreaking is very much besides the point, though it does point a picture of how you believe your own toxicity and vileness is justified and that *you're* the victim of your own transgressions.
You stink of someone that'd immediately go full violent incel after being rejected by some goth-punk girl you thought you'd impress by being so comically aggro. Maybe you're not, but that's absolutely the vibe you give, and perhaps you should work on that.