Americans sure love their war crimes! Indiscriminately killing civilians is how they've gotten past, present and future terrorist attacks. I can't imagine the parents of the children they keep on killing (or maiming, or otherwise) standing by and watching. People wouldn't necessarily need to wait for their country's army to do something when they've got nothing significant left to lose.
Why, that's why you don't do genocide half-heartedly, you need to go all in, roll up your sleeves and really get down to work! Can't get a swarm of radicalized people if there is no people left to get radicalized.
To be fair, Iran is not pretentious either, killing a few thousand people because they dared to protest.
There are no good guys in this conflict.