When we see a young kid smoking or doing drugs, we blame their parents. But once upon a time, their parents were young. Perhaps they picked up their habits from their own parents or elsewhere, and are merely passing it on. Society as a whole seems to have a prejudice favouring kids, when in fact everyone is a victim of their own circumstance. Just because adults might be older doesn't mean they are capable of making socially acceptable decisions. Their decisions are based on the philosophies they developed as kids, and as people grow older these philosophies only become further ingrained. As a society we don't have a standard philosophy, and all our philosophies are subjective and relative. Nevertheless, people will often blindly stick to the philosophies they learnt as a child, and all thought exists only to exemplify everyone's individual philosophies. Rational thought does not exist because there is no objective standard. A striking example of this is religion (and I'm not trying saying it's a bad thing, it's just another philosophy, after all). Believers who were brought up with a religious philosophy as children will often retain them, and when an atheist debates a believer, he/she is not battling against the believer's rational mind, but against their philosophy. Conversely, a believer is not battling against an atheist's rational mind, but against their philosophy, which is a product of their upbringing.
tl;dr: Humans can't think, they only copy.
Now to the subject of discipline. If humans can't think, then nobody can be guilty... this is tricky. On the one hand we can pardon everyone who was 'born with it', 'had bad influences', or 'mental illness', and slide down the slippery slope to anarchy. Or, we can prosecute people according to the damage they inflict on others, rather than focusing on the offender themselves. Neither solution is fair, but at least in the second solution we can 'keep the peace' and hopefully slow the spread of the anti-social philosophies. We will never completely eradicate them however, as they are just part of human nature.