Unless drug induced or mentally unstable we're brought into life capable of benevolence, as well as evil. Man is neither good nor bad, we're somewhere on a scale between the two, we're placed upon this scale by people that judge by what they believe to be just, our assumptions of what is just tends to be decided from morals and ethics bestowed upon us by our family, culture, class and status. You're asking such a broad question "Why do we commit crimes" We do wrong for personal gain, this idea has been around since the beginning, Prometheus, Icarus, Satan, all these characters perform evil and "crimes" because their situation is not pleasing to them, they are restrained by society, this brings on the idea of anarchy, that we are oppressed by the government and that we're oppressed to the point that we cannot achieve freedom.. I won't continue mainly because I'm too low on time, however in the grand scheme of things we commit crimes for personal gain.
