Most of these people do not know about the horrors going on in places like Yemen or Myanmar. And if you tell them about them, they don't suddenly feel a need to rush out and start pressuring others for a cease fire.
Countries around the world erupted in protests against Israel and in celebration of the attacks on Oct 7th before Israel even responded.
The answer is quite simple, they hate Jews. The reason those other issues don't elicit a reaponse boils down to no Jews no news