Probably because the west supports the genocidal country, and the U.S. is directly funding the genocide (in the 10s of billions, I believe). So, theoretically, if there is enough dissent from western civilians, the west could exert enough political and economic pressure on Israel to stop the genocide and end the apartheid (since Israel is so dependent on the west).

I admit, I'm a bit ignorant of the most of the other genocides listed above, but I don't think the U.S. directly supported the genocidal groups to the same degree, and I think those genocides would've needed direct military action to end. In the case of Xinjiang, I don't think the U.S. could do anything about that without causing great harm to itself.

@Syntha only if the Jewish people happen to be living in Israel. Western news media is way more interested in Israel than it is in almost any of the other countries I mentioned.

I think this is partly to do with the US because it seems to loom especially largely in their political consciousness.

People care more about things they know than things they never heard of. Someone posted a very informative documentary about West Papua over in worldwithoutus recently and it was interesting to see how many youtube comments on it were from people who had previously had no idea what was happening there! And now they know, they do care.