True for most countries except israel, Israel has killed american soldiers even. From the very beginning of their state. Look up the USS Liberty incident. They bombed the warship with mirages to make sure their cold blooded murder of an arab coastal village wouldnt be investigated.
Friendly fire happens all the time. Israel handled it about as well as they could have, by apologizing and paying reparations. It's also been 58 years now since the accident.
American soldiers have also killed thousands of American soldiers; should the US punish itself?