Right but the reason we have rules against people declaring no quarter is to prevent a race to the bottom. It is absolutely reasonable to respond to a no quarter declaration in kind, which is... again... the entire reason we have prohibitions on it.
Yep. And war crime seems to have lost all meaning in the US.
But, even if you dismiss the idea of international standards, this is clearly very bad for US soldiers (and sailors, airmen, etc). I wonder if they see that.