Causes
He's correct in saying that, at this point, it's not feesible to remove guns from U.S. society irrespective of how anyone feels about it
Something which has been pointed out on occasion is that some other societies have armed populaces and don't have this issue.
So what is it about the U.S. that began in the 1990's (which is when I think mass shootings mostly increased) which is causing this.
My thoughts:
Perhaps it's over or under medication, as it seems a lot of people like to medicate their sons over there because they think aggression (which men are built for) is abnormal, when actually it's entirely normal and needs social control and funneling.
Perhaps it's the lack of fathers in the family unit so there is no one to teach and show boys how to behave and restrain themselves (see above). Yes, I know it's a trope, but I think it may well be playing a role. Boys need male role models and without them are morely likely to go wild.
Perhaps it's society sending the overt blanket messages of contempt aimed at men and boys, particularly in the US and particualrly in the last 10-15 years. It's happening in the UK as well.
Perhaps it's how the public U.S. education system works. I've heard this this may be a factor, but not sure.
Perhaps it's that colleges and universities have become a hostile place for men & boys. Look at the number of boys not going on to further education or dropping out across the west vs. the number of girls. I think this is because, historically, girls have been seen as needing it and boys are seen as not. It's now flipped and there's no political will power to help the boys because: ideology and the above view that boys and men are problematic.
And perhaps it's a deeply terrible mixture of the above.
If any of the above is correct then maybe address *those* issues and maybe the mass shootings will decrease or even disappear. Also, it might help stabilise society and most of all help boys instead of neglecting them and keep them from beomcing disenfranchised.
Food for thought.