Your thinking is very flawed and two dimensional. First off countries with more gun control are not safe. But with a 68 million populace, UK has a scary number of Stabbing. Would you believe 44,000 knife attacks in 2019. While knifes attacks only account for 6% of UK crimes attacks. While bats (hitting with a blunt object) or glass bottle account for another 6% so that another 44,000 attacks
The difference is knife crime accounts for a very narrow demographic. It is overwhelmingly perpetrated by, and on, very young black males from inner London council estates. It simply doesn't effect other demographics and other areas whatsoever.
London is no more 'shit hole' than anywhere else and in fact has been very much gentrified over the last few decades.
I used to think America sounded wonderful and dreamed of traveling around particularly the great lakes and your national parks but now I wouldn't live there if you paid me. I'm not being unpleasant, it genuinely terrifies me. Remember you also have had bombing and death by motor attacks. It's true we had Dunblane a horrific attack on a school by a mentally ill boy, too, when I was a kid but what's happening in the states is beyond the pale. The thought my.kids could be unsafe at school would terrify me.
What Simon says is true you guys need to spend some of those millions sent to Ukraine on school security and I'm afraid the time has come for armed guards.