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.
To me, this means that most don't personally care about what's going on in Palestine, they've just been told what to feel by social media which has filtered all Israel/Palestine information through a megaphone. These people flitter between one cause after another, never forming their own opinions or taking the time to view things objectively. They just wait for what the internet tells them they should feel and act on it.