As for killing innocent people... it is a simple task for the US (since you brought it up) and it surprises me you think the US doesn't kill innocent people intentionally... which means you believe it is always accidental or mistaken? Or that it never happens?
I was in the military, and im well aware of their rules on killing innocent civilians, and ive never met a person in the military that i thought would break this law. You need to understand that their is alot of pride in the US military ranks, and they pride themselves on being good people who fight evil. There is NO FUCKING WAY you are going to see a bunch of US soldiers purposely killing innocent civilians.
Who you may have met, and how much 'pride' some people may have in that they fight evil is great. But if they conclude that someone is evil (whatever that really means) then would they not kill them? In a tense, stressful time in a foreign nation where they aren't sure who may be an 'enemy'?
Imagine all the people that live in your neighborhood...how many of those people do you think are capable of firing indescriminately into a crowd of innocents? The military is no different. Military people, for the most part, are just like everyone else you know, only they are in the military, but being in the military doesnt instill some sort of murdering instinct, in fact its quite the opposite.
No, it gives people the ability and tools to kill - and puts them in a situation likely to produce violent results. It's just math, really.
In boot camp, you spend an entire week learning about the rights of combatants and non combatants, and they are very good at making you scared as hell about breaking any law in the UCMJ (Uniform Code of Military Justice).
If you are in the military, and you murder someone outside of a military base, you get tried and punished by 2 courts. First the local civilian court gets to punish you, then when you get released from prison 20 years later, the military will try you for murder and theyll give you another 20 years, if not more. Its called "the double wammy" among military personel, and its no fucking joke.
uh... okay, great.
Im telling you right now, that the people in the military are far more likely to obey laws then people who are not in the military, because they will fucking nail you to the wall if you mess up in the US military.
Are there crazy people out there who might break the law and commit murder? Duh, of course, but just because some crazy guy murders someone, it doesnt mean that its US policy.
Bad apples, I get it. I don't think that just being in the military makes anyone anything, murderer or whatever. It is situations that cause things... for example, put people into a stressful situation where they might lose their lives at any moment, and give them weapons and you may find that (like anyone) there is a tendency to feel threatened and react, or 'pre-act' in certain situations - not because the 'army is bad' but because that is human nature.
I assume, if the US was occupied - you would not roll over and take it? But perhaps, resist in someway? Or even fight? Would that make you evil?