Yes, opposing the establishment of a new state with a new population where someone else already lived would have been appropriate in the late 1940s.
Unfortunately it’s 2024 now, Israel does exist and time is linear.
That means that if you commit a crime and wait long enough, it’s legitimized. No way in hell.
Forcefully drawing a border less encouraging of violence against native population. Also forcefully stopping all their meddling in the form of military occupation, blockade, block posts and so on. Arming their neighbors so that Israel doesn’t have such a military advantage.