Real life example:
You've probably read this story:
http://news.bbc.co.uk/1/hi/wales/8370237.stmAccording to your school of thoughts that goes "Henry cheated so he's a cheat" this man must be a murder because he kill his wife. Yet judge let him go and now "murderer" is roaming the streets.
Or did judge get it all wrong? Maybe you should explain to him that life is "only black or only white" and there's nothing in the middle and that somebody who breaks the rules/law should be branded a cheat/criminal no matter what the circumstances...
Tomorrow my boss is going to ask me how my weekend was and I am going to say it was good even if it was shiit. I guess that makes me a liar then...