Given that vengeance id a very powerful drug and can be all consuming its something that should be avoided. If its allowed to become part of the culture you end up with the blood feud cultures of albaina and others.
The social deal is we give up the right to vengeance and the state deals the complicated process of dealing with the offender. even though individuals loose out, society gains in a big way.
The question though is, when this social contract is broken, should you take go on and seek out your own justice and vengeance?
Dragonfly94, you want vengeance on the chap, let him settle in, if he is into old habits, he will find his opportunities in thailand. find out if he is and then dob him to the right agencies... some of whom take this kind of thing very seriously.