I'll tell you what I think.
When the US bombed Hiroshima, it was a terrible thing. Innocent people died horribly.
When we firebombed Dresden and other cities, it was also a terrible thing and people died horribly.
What it wasn't was genocide. It was war. We were inflicting mass casualties on an enemy who was trying to do the same to us in an effort to end the war with victory as quickly as possible and with the least amount of casualties on our side.
Israel is destroying Palestine. It is a terrible thing. Innocent people are dying horribly. Despite that, Hamas and its friends take every opportunity to attack Israel and reject all attempts to end the conflict.
It is a war. It cannot be genocide while both sides are attacking each other, and it cannot end until one side surrenders or is obliterated.
History lesson, moral judgements and definitions have no bearing on this reality.