From the BBC:
The US called the images "heartbreaking" but insisted Israel had a right to defend itself.
"Israel has a right to go after Hamas, and we understand this strike killed two senior Hamas terrorists who are responsible for attacks against Israeli civilians," a White House national security spokesperson said.
For America to express the event in these terms, as though the mistake of the attack was not entirely out of proportion in relation to the gains -
given that 50 sheltering Palestinians were killed, including children, and at least 180 more are being treated for horrible wounds by one agency alone -
is not in the spirit of the law and makes the USA seem weak, it is so nonsensical as well as immoral.
Just at least say Israel made a catastrophic decision in carrying out that attack, and they had told them not to go there.