The Arabs in Sudan are killing non-Arabs there, but the US doesn't provide aid to Sudan, so what's the relevance to this discussion? The reasons why the US gives aid to Arab states was the topic under discussion.
America wouldn't be supporting Egypt & Jordan to the same extent if it weren't for backing Israel, too. I really don't see how that's even debatable, except perhaps in the warped mind of Zionist enemies of humanity in general, America & Arabs in particular.
During the Cold War, when Libya switched to pro-Soviet & Egypt switched from pro-Soviet to pro-US, there were also reasons for Ameica to support pro-Western regimes, but that's no longer the case. And even then, the USSR had an opening in the region because of Arab anger over US backing of Israel.
There have been a few Arab regimes as brutal, even genocidal, as Israel, perhaps, but certainly not proportional to population.