There are more important things than the issues you cite. If losing historical content and "niche communities" having to go find new hobbies means just a couple fewer kids don't get shot this year, then I'll take that trade. And I hope you will consider taking it too. Are your hobbies really that important to you? What's your worst case scenario? Mine is yet another school shooting, but this time in my kids school.
More generally, I really hope that as a society we can find some way to back away from extremism. As a liberal, I'm dismayed by the cancer that Trump represents. But I imagine that his supporters are just as dismayed by things liberals do. The more liberals push for gun regulation, the more the NRA won't budge an inch, and doubles down on even more extreme positions for fear that liberals will confiscate all guns -- give an inch, take a mile. Sooner or later, people are going to decide they really have had enough and start actually proposing to take that mile, because we can't seem to discuss things and come to a reasonable compromise.