BeNotAfraid, I take it you think that guns and knives are banned in the UK, that's simply not true. I've got loads of each, thanks.
As for - "Useful idiots"....and note "that look" in these folks eyes--Zombified beyond any hope of restoration'', you simply don't know what you're talking about!
These people probably do all share a similar look in their eyes, for good reason, it's called grief!
These 'Useful idiots and zombies', as you call them, have all lost loved ones to knife crime and other such murders in the last couple of decades. The black guy is Richard Taylor, whose 10 year old son Damilola was murdered in 2000 and the guy on the right is someone I actually know called Barry Mizen, whose son Jimmy was stabbed to death in 2008. Another lad, Rob Knox, was stabbed to death half a mile from my house in 2008.
These grieving people are all trying to limit the numbers of stabbings in the UK, especially in large cities such as London, where knife crime is out of control.
These people are simply trying to get kids to hand in any knives they may be carrying, in the hope of stopping more bloodshed - they are not expecting everyone to hand in the knives they eat their dinner with!
I hope that you never become a 'Useful idiot' or 'zombie', as a result of losing a child in a horrific murder...