Suicide is no longer against the law. Too many people who didn't commit suicide were hanged for it!

Besides, it's probably an infringement of people's Human Rights to be prevented from killing themselves.

Seriously though, I do believe everyone is valuable and deserves all the air he/she can breathe and more. Although some people are best removed from society for the general good of the others.

As for the Derby incident, the UK has more CCTV cameras than any other advanced country. I'm sure that if the police don't already know who those kids are, they could identify them from the tapes. But what good would that do? All they did was jeer. They didn't push they guy. Telling someone to kill himself is not the same thing as helping someone to kill himself (which is definitely against the law). I don't think you'd get the Crown Prosecution Service to even think about trying to get a conviction for this.