For me it depends and I think it does with all people on what 'crime' is being committed and how that crime fits your own personal view of right or wrong. Would I inform the police or deal with someone abusing a child, elderly or otherwise vulnerable person- yes every time, without exception. Would I report someone running a business from home, smoking in their works van or who downloaded muysic from the internet, of course not. this is because I personally feel that those sort of things are not sufficiently important to warrant anyone else getting involved- and to report such a thing I would consider someone a ' do-gooder'. Now that makes me guilty of considering my opinions as being better than the letter of the law, which is obviously true of everyone, we all have opinions one way or the other, not many people have never committed a crime themselves, even if it's only keeping the pen they accidentally took from work, so to me most ' do gooders' who report trivial misdemeanors are hypocrites whereas someone reporting child abuse is absolutely doing the right thing.