I think a lot of "bad girl" types are just rebellious against certain things but don't necessarily have an "ideology". A "bad girl" might be just as easily look at you as a kook for libertarian ideas as a "good girl".
Having said that, I got into an argument w/ a "good girl" a few months back regarding free markets and she got really upset at me. It's a very difficult battle to convince people about the merits of free markets. I've talked to many friends about this type of stuff and I don't feel like I've changed anyone's opinion (at least about the big stuff). It's frustrating but I try to keep my head up and remind myself that things are going to get really bad here and that I need to focus.