I'd lik to thank you for showing exactly what I've been saying. Alignment is the tool for enforcing player behaviour.
Well, yes and no. It is a tool, but more for advisement rather than enforcement. Chaos generally doesn't adhere to Order, therefore, Chaotically aligned individuals and monsters are less likely if at all likely to follow "laws". Whether these "laws" be mystical, societal, or otherwise is open to debate but it means that given the choice between buying something or stealing something, if the potential risk is greatly overshadowed by the potential reward, Chaotic characters will steal. Should it be the vice-versa, they'll begrudgingly buy but only because it is the smarter/wiser thing to do. Which is where if you have a Chaotic Evil creature with low INT and WIS scores, they'll steal without question because they don't have the ability to think enough ahead that the act of stealing will result in greater risk than the reward is worth.
Good is generally not going to bring some form of harm or inconvenience to others unlike Evil which will do any of these and more should it benefit. Good characters might not always be charitable or even chivalrous, but they won't go out of their way to hurt others. Not to say that a low INT Paladin won't accidentally bring harm to those around him/her because of something they didn't think about.
All in all, regardless of alignment, a player should attempt to follow his/hers as closely as they can without constantly being reminded as to whether or not something will be against said alignment. And further, not all alignments are cut and dry, just because you play a Neutral character, doesn't mean you have to not care about others and only care about yourself and what you potentially get out of it. Neutrality is a balancing act, for every good deed is an equally evil one and for every law followed an equal one must be broken. Players shouldn't be punished for alignment based insurrections unless it was so far opposed to his/hers that it becomes a problem.