Yeah...

You know when you do something and later all you can think is, "Well, that wasn't me."  I think they call that compartmentalizing.

Also, when you do something you shouldn't but somehow you expect not only will you get away with it, but you will have no ill effects whatsoever? 

I think they call that "hubris."

Of course, there's always the case where you do something a little bit shady to avoid doing something clearly insane and destructive.  I'm not sure there's a term for it, but I'm going to go with calling it "innoculation..."  (Though wikipedia seems to think the idea I'm going for is called variolation.)