Another aspect is that what people think of themselves isn´t always what they really are.
Everybody considers himself to be a good person as long as they aren´t the devil´s incarnation.
Al Capone thought he was doing the world a favor with fighting prohibition, regardless of the murders and other crimes he had to commit.
Saddam Hussein thinks of himself as a hard but just leader ( i read a few excerpts from his book)
Some people think it´s okay to invade other countries for their oil.
I bet everyone has a more or less plausible explanation why he , despite everything he / she did in life, is a good one afterall.
So if you think you are an angel chances are that you are not.