> unfathomable to me that a large portion of the populace is okay with [...] direct and terminal negative impact on children's lives.
That's because those two things aren't true. It's a lie told by statistics.
Firearm violence in that demographic is largely from places like LA and Chicago where gangs are the problem and firearms are already illegal.
If you're scared for your child's life every day they go to school, you have been brainwashed by media FUD.