For a lot of Black, Brown, and Indigenous peoples it doesn't take long to get to the realizations:
"Holy shit zionism is racism."
"Holy shit zionism is colonialism."
"Holy shit zionism is imperialism."
because we are affected by those issues.
It's no surprise that the white masses fail to move on this when most of them have such a shallow understanding (if any) of racism, colonialism and imperialism.
Consequence of that lack of understanding, is it becomes very easy to implant doubt.