There’s any number of ways to make a difference that are better than shooting a man in the middle of the street.
Are they really? How many people have been doing those things for decades with very little to show for it? How much campaigning can a parent paying for cancer treatment for their kid be reasonably expected to do? How many generic responses from representatives not listening to the concerns of their constituents should we trudge through?
Whether or not this shooter was motivated by the reasons we’re all assuming is pretty irrelevant at this point. The simple fact that we’re having this discussion at this scale demonstrates that people do not believe that the things you mentioned will improve things, and I think that’s a perfectly reasonable interpretation of the situation we find ourselves in. Maybe vigilante action is not the answer but I think it’s pretty clear that the usual responses you’re giving are not resonating with people. Decision makers need to change that perception if they want to prevent people from looking outside the system for answers.
Not if this was an isolated incident. If it turns out to be something else then maybe.