Well, it depends on which religion you are speaking about when it comes to how Karma is handled. From the Buddhist perspective I can tell you that there is no "Karma Caretaker". There's no higher power with a check pad marking off "good" and "bad" actions. Plus there are no inherently good or bad actions. There are actions that are harmful vs beneficial vs neutral with the vast majority actually being neutral.

Now to your specific question. If there are no consequences to our actions, no being caught, no karma, no judgement or whatever system of beliefs you want, then, in my opinion, there is no reason to ever care about morals or principles. Just enforce your will on others whether they like it or not, take what you want, it doesn't matter.

But I personally believe it does matter and will come back around.