Is the law all that is stopping you from killing someone? (for instance)

People (generally) do the right thing because it is the right thing, not because they might get caught,

Right, but how does that sentiment get encoded in such a way that AI models can exhibit such things as "morals" or "ethics" in alignment? Murder is a bit of an extreme case. For example, countless people break traffic laws all of the time, so neither their internal "ethics" nor the law prove to be a reliable control. I can't get on the highway without driving the speed limit and being passed by almost everyone else on the road; and that behavior is arbitrarily more dangerous than following the speed limit and statistically more likely cause someone to be killed than following posted speed limits. I guess my point is that this is a very complex topic and I'm not smart enough to have any answers.