@Khethil,
The problem is in differentiating what you believe in and what you would want to believe in. Every person is complex, some more than others admitably, and to create let alone adhere to a code strictly is nigh impossible. I am unsure which is the correct view - if society is to blame for this, or if we are in debt to it. Obviously not everyone is allowed to excercise their true beliefs efficiently in today's society, but it also helps keep the ones we dislike at bay, like a filtering system for ideals.
Anyway, I have stolen but I wish not to be stolen from. I have gotten lucky and attributed it to skill or justice yet do not like it if someone cheats me of what I think I deserve through luck. In the end, as each second passes we are not the same person we were before and the same ideals will not stand firm in every situation we encounter throughout our lives. This is in my opinion good and is the main ingredient of progress.
EDIT: I forgot to mention that I often try to stand firm in my belief not to force my beliefs onto others, but not even that, one of my core beliefs, is the smartest option nor the one I opt for in some situations.