the problem with the whole mental health issue is its only addressed AFTER the fact cause AFTER they go out and murder numerous people they must have a mental health issue....
howbout the fact they they have a bad temper or want revenge or want to impress their gang members so they can get jumped in or want attention or their 5 minutes of fame. there are WAY more issues with people murdering others with guns then unstable mental people. they make up like 1% of the murders. the rest are simply crimes committed by people with access to a tool that easily kills another human being.
and even if they were aware of someone who is mentally unstable what do you do with them? lock em in a closet for the rest of their life? I dont think guns are the single fix to our problems but it is the single tool used most often by criminals to facilitate their felonious crimes. it aint bats, knives, brass knuckles, whips, etc.... its GUNS.
like I said the UK has plenty of mental health issues but no gun violence cause there are no gun to be violent with. I dont see kids or adults in the UK blowing chit up daily because they cant access guns. do you? they have access to GOOGLE as well dont they?