Criminals are greatly emboldened to the point of mania when they know there is no danger of the other guy shooting back. Worrying about getting arrested for doing things against the law is what law abiding people worry about, not criminals.
The only strong deterrent to man's brutal and savage nature is the threat that other people can hurt you back as easily as you can hurt them. In market terms, potential risks provide a very strong penalty against certain kinds of behaviour and force market players to think more carefully about their actions. Where there is no penalty the ravening wolves that are hatched from the human gene pool feel no restrictions on acting on their impulses.
Just like in Britain, incidents are increasing daily in this vein despite best efforts of the idiots in goverment to spin them or cover them up. They will escalate until eventually there is a state of anarchy where formerly honest men kept civilization through arms.