Never,
because
"You can't be right by doing wrong; you can't be wrong by doing right."- Thomas S. Monson

What this quote is saying is that you can not be right by doing the wrong things and you can be wrong by doing the right things. For example, you are home alone and some friends come over and they throw a party but your mom and dad don't know that the right thing to do is tell your mom or just tell your friends. But lets say you let the throw the party are your mom finds out and you lie and say that it was not you and you did not know about it yes you did not throw the party yes you did not know that it was going to happen but if you told your mom or just told your friends no you would not be getting in trouble. What i'm trying to say is that when you do something bad or let something bad happen dose not mean you did the right thing because you would get in trouble or they will think you were part of it and you can not be right by doing something wrong. There is a big difference of being right when you do something right than being right when you do something bad.