Comment by IshKebab

Lack of access to guns definitely does make a significant difference though. Even though the psychos still go psycho, they use knives instead of guns which are far less effective.

For example the most recent psycho attack in the UK was only a few weeks ago:

https://www.bbc.co.uk/news/live/cm2zvjx1z14t

He stabbed 11 people and none of them have died (though one is - or at least was - in critical condition). Ok that's comically incompetent even for stabbing, but even so he would have done far more damage with a gun.

And don't give me that "but other people would have had guns and stopped him" crap. It rarely works out like that.