Why don't we kill pedos?

Why don't we kill pedophiles and child molesters? I see these freaks bragging about being pedos or talking about kids they see in public all the time here on 4chan. Execute a few thousands of those sick shits and I fucking guarantee that shit will stop.

>>101
Oh, right!
"Put yourself on this sex-offender list, so nobody will ever give you a job, every neighbor you'll ever have will hate your guts, your whole family will cut you off… before you even get the chance to prove you ain't actually done anything.
Basically your life will be over, just cause you did the crime of feeling something. Might as well shoot yourself right away, and save us the trouble. Make sure you get your whole head in front of the shotgun."

Riiiiiight!
Basically, we (the society) are telling pedos that they might as well go rape a loli or two straight away, then they'd at least deserve what they get; essentially, you're damned if you do, damned if you don't.