It's a pretty commonly used saying in England, didn't realise you guys didn't use it. It basically means "cannot be bothered".
When studying American history at school, we were taught that the settlers played a a large part in the massive decline of Buffalo. It's a known fact that the US army sanctioned and endorsed mass hunting of buffalo, as did the federal government. (Moulton, M (1995). Wildlife issues in a changing world, 2nd edition. CRC Press. - The quickest source I could find offhand to back my claim up, I'm sure your local library will have a copy if you want to check it out)
So white settlers only engaged to defend their land huh? So why is it then, that in 1838 president Jackson decided that the Cherokee people could no longer stay in their home state of Georgia? Surely then, any battle that came of consequence to that action was infact the natives defending their land, and not vice versa. You might want to read up on the Sand Creek massacre, which funnily enough was white settlers completely wiping out every man, woman and child in the camp. Then again, Americans never intend to solely end life only to protect it, right? This of course, isn't to say that the Natives were without their own heinous crimes, however it was their land and home that was invaded. Surely as a soldier you would do anything to defend your home from invasion? So what makes it so bad that they did? I think the fact you refer to them as heathens already removes any need for me to argue the Christianity point, it's that superiority complex that caused 99% of the troubles in the first place, glad to see the ol' USA spirit is still burning though.
They effed up? That's your excuse? Either they deliberately done it, or were really poorly trained and lacked discipline. There's no way a British pilot would of made the same mistake and there's no way if he had it would of being so brazenly swept under the rug. Also the statement "neither of us were there" is pointless, if you're going by that, then every other point you've made and I've made is invalid, as neither of us were there at those times either.
I'm not going to quote the last few points separately, as really they can be addressed as one. Had ANY other country fired a nuke, no matter what the reason, there would be outcry, especially if it was aimed at American soil. If say Iran was to nuke the USA to bring upon quick, unconditional surrender, you sure as hell wouldn't defend it then. And like Japan, nothing short of a nuke will stop America's policing of the rest of the world. Also in regards to the enemies not having weapons of mass destruction, that may have being true for the second world war, but the soviets DID have them by the time the cold war was in full swing. Yet they didn't use one. And in response to the "they'd have used it not just for military purposes, but for global domination. " argument, I honestly have to say that it's ridiculous to even try and sue that in America's defense. America is by far the most intrusive, oppressive nation in the western world, and it's definitely the one to stretch a dominating hand the furthest.
And finally, in response to me ducking a debate, you were right, I was ducking, only because I've being posting from a Playstation and they're not really made for entering long winded debates over the internet.