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That may be true about cops and lawyers because everything is about politics these days. I imagine it's easy to get caught up in the system and lose focus of the original goal. But most criminals, that have not been caught, tend to play by a different set of rules. There are no political distractions when you're on the hunt. The rules are flexible and can change at any given time.
by wilfulThe criminal enforces his ethical code just like the police officer enforces his (and each of them believe their actions to be just)
I'm not sure what you mean by criminals enforcing an ethical code.
If you're not in a gang or criminal organization, an ethical code isn't necessary.
It doesn't matter if you're actions are 'acceptable' or morally 'appropriate' when breaking the law. The only things that matter are the objective goal (pleasure, money or revenge etc.) and making sure you don't get caught.