Or else you do not have any other way.
I am baffled by this in some ways - don't you realize that 'the criminals' are all of us? We could ALL commit crime, depending on circumstances. What's with all this self-rightousness?
I see the point of the original thread - some crimes are too terrible for words and beyond understanding to anyone except perhaps a psychiatrist. Very heavy motivation for protection must come in, the safety of others must come first, and thought of revenge (sorry Ian) are understandable, if useless and pointless since they do not deter.
But there is so much other crime which is at least understandable - provocation, need, stupid temptation, thoughtlesness - the criminals are mostly ordinary people who do something wrong. Apart from the hard core ones.