I have an old school friend in this position. He was born in America to English parents, but moved here when has was young. Then after uni, he married an American lady, and moved back to America. He now has 2 boys of his own. The funny thing is, his parents moved back to the UK because of all the shootings - it was a massive problem back in the 70s too. Yes, seems worse now, but still was a problem then, over 40 years ago.
Sounds like he is stuck there as his wife has an important job, but I can tell from his FB posts that he really is not enjoying sending his kids to school. They routinely do
shooter drills now, hiding under tables, locking classroom doors etc, in case of emergency. It's crazy children have to do this - we haven't had to do that sort of thing since WW2.