oomis, i hear but lets ASSUME that hashem said not to kill cause its an immoral thing taking a life, do we not kill now cause its immoral or cause hashem said so? “
Good question, and I hope I can answer it well. Hashem didn’t say it’s immoral to kill, He just said, “Lo tirtzach.” That’s why we don’t. The fact that it IS immoral is probably WHY He gave us this law, but there are people who think it is NOT immoral to kill certain types of (innocent) people. So if it were left up to them to decide whether or not it is ok to do so, they would say SURE. BTW, it’s not really “Thou shalt not kill,” but rather, “Thou shalt not MURDER,” otherwise one would arguably likewise be prohibited from killing in self-defense, or in war, etc.
Think of the issur on eating chazir. The Torah doesn’t tell us WHY Chazir is not kosher, only that it is one of several animals specified by name as being unkosher, having only one of the two mandatory simanim for kashrus. The fact that pork is known nowadays to have been a source of deadly trichinosis or the like, is wholly incidental and irrelevant as to why we don’t eat it. It might even taste great (I would not know), but it is assur, so that’s that. So do we not eat it because of a million and one logical (moral, so to speak) reasons, or do we not eat it because “Hashem said so?”