Back at ya brother-- "Everyone that says that must be an egocentrist asshole" basically sums up your response.
Nah, it sums up a quick way to trivialize and dismiss my response so you can get back to explaining why you know better than everyone else, which is exactly what debate has become now: telling everyone else what their positions are more loudly than they can tell you what yours are.
My point was that everyone's an egocentric asshole on some level, if you want to call it that, more evidently now than before. You, me, Wayne LaPierre, David Hogg, everybody on every side of this debate comes in by default convinced they're not only right but uniquely right and ready to explain how everyone else went wrong. All the questions are rhetorical now, and all the answers come with emoji and hashtags.
See, you didn't ask me what I contributed. You asked you, answered you, and were very satisfied with your answer to your own question. That is, more or less, the fundamental unit of discourse now: explaining why the straw men in our heads are wrong.
If we're ever going to solve the gun control question in a way everyone can agree is better than the alternatives, step one is not figuring out how to debate with rabidly entrenched lunatics who can't see reason. They're really rare, and not as influential as we or they like to think; they just get signal boosted a lot because they're fun to mock. The people who think they're the only sane person possessed of the most comprehensive and accurate dataset, on the other hand, are approximately everyone, and as long as we pretend that they're entrenched lunatics we keep convincing them (and us) that we're all right in our assumptions.
Step one is, I think, to find a way to get a bunch of egocentric assholes to agree on a single set of facts as accurate and complete.