Not all criminals are thrill seekers or doing it for the adreniline. Rapists rape so that they can orgasm and feel dominant and superior. Not that I waould know form experience, but "Ooh, arn't I a naughty devil" is probably the last thing that they're thinking.
The legalisation of drugs is bad for a simple reason. Kids. It's a choice to do drugs if you make the choice during adulthood, but when you're 12, have the media making drugs seem awesome and peer preasure, you will not be making an educated decision, and in some cases, you will get addicted. And that's not including the external costs such as the hell it inflicts upon public healthcare should such a thing exist in your nation.
As for the execution of murderers, rapists and other such filth: Agreed, however it is not unheard of for folk to admit to these crimes of which they are innocent. I seem to recall a few days back there was a wonderful video concerning why you should not speak to police in which they highlighted 2 cases from the 50s or such. 2 african/american gentlemen with mental dissabilities admitted to rape and murder in one case, and a selection of other crimes for the latter. The only thing that saved them was capital punishment not being practiced in the state at the time. Unless it can be proven beyond all shadow of a doubt that they were responsible, we can't see them executed. What passes as proof is subjective to a degree, so there goes that plan.
Now some folk seem to be drawing near the bullseye with upbringing, and yes: The upbringing is important, though the government don't know their arse from The Northern Lights where enforcing a good upbringing is concerned. They seem to think that compulsory citezenship lessons are a good idea this side of the pond, which as anyone who's been through them will assure you, are a total waste of time. This may come down to a proper upbringing, once again, being subjective. To me, a good upbringing is one involving the refrained, though effective, use of the backhand. Could you honestly be negotiated with when you were a brat? Did you care about the state of anything? No. Because you were too young to be expected to look after it. So you looked out for yourself.
I realise now that this is becoming a rant, and I apologise for it. I'm sure that there's some poor semblance to a point somewhere up there.