Instilled in all people is a basic compassion and caring for humanity.
Untrue.
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Anywho, uhm. Okay.
When we're born, as we are, we have no knowledge of anything.
We are sponges. We have no moral instinct. It is purely savage[instinct], as is shown in many other animals, and can be immediately noticed in young humans. Actions/happenings throughout existing shape the moral part of our conscience. This is, obviously, related to laws.
Example. You grow up with society saying that murder is wrong. That is a CAUSE of moral shaping. Unless another CAUSE comes along, effecting it, your moral conscience will exist following the law that you have been told was true. In this sense, the event of you killing someone will be, in most cases, non-existant, because your moral p-o-v knows that society says it's wrong.
If, however, while you were still in the 'sponge' stage, and the society that you were in never stated that murder was wrong, the event of you killing someone without a heavy conscience, in any particular case, would be more than likely.
In other words, morality cannot exist without rule, simply because rule shapes morality, no matter
what that rule may be.
You are not born thinking that life has meaning.