Browsing in an "adult store" at lunch hour, you witness a colleague buying a large inflatable woman. Do you mention it to co-workers? Nah. Especially since I'm sure someone would just say, well, hey, what were YOU doing in an adult store. Besides, who am I to judge? I am sure I do some things others would not...
Your eight-year-old is getting pushed around at school. Do you tell your child to "turn the other cheek"? No way. I don't want my kid getting bullied. I would talk to the teacher about it. Plus I would want to know why the teacher wasn't aware of the situation in the first place.
An armored car turns over across the freeway. People are stuffing their pockets. Do you join them? Sure...in theory. I would probably be too chicken though. :(