Obviously any kind of currency an be use for both good and bad. I don't know why are you asking these kinds of question. But for Bitcoin in particular it has no special features in which it can be advantageous for people who want to use it in good, But for Criminal it has features for security and anonymity. But yes it's how a person use his Bitcoin if it is good or bad.
Yes i agree!all cryptocurrency can be use for both good and bad. Bitcoins in particular eas now using by many people, not only for the good sake but also in bad way. If the question was of bitcoin can be use for good, good as in for lifetime, i think yes, bitcoins really helps a lot, many users are enjoying the benefits of having bitcoins. Bitcoins was a big help for me. It reduces my problem in financial crisis.