Spanxxx

Where do you think your parents received those notions of rights and wrongs? The United States, and most countries for that matter, have laws against killing other people. Often these laws trickled down from the religions that formed and shaped the peoples of those nations. As for the US, which was founded as a "Christian State" in essence, it's laws were thus laid out very accordingly like the bible's own messages on rights and wrongs.

Therefore, your parents telling you "not to kill someone" is still based on a message that they learned through training from a life under the reign of a nation founded on the bible.


Now, removing the bible and religion entirely, you can also make the judgement that outlawing killing and vigilante violence from a society leads to a more productive and structured populace that understands there are consequences to its actions and hopefully deters from actions that harm others. Of course, that doesn't necessarily stop anyone from hiring a good lawyer and getting away with what they've done. "If the glove doesn't fit, you must acquit!"