The vast majority of American voters support Israel in this war and do not consider what Israel is doing a genocide (55ff.):
https://harvardharrispoll.com/wp-content/uploads/2024/01/HHPJan24KeyResults.pdf
I think you fell into the common trap of believing that your particular filter bubble is representative of the general consensus.
And then you get Trump. Ever looked up his Israel policy? Got any other brilliant ideas?