Problem you seem to be missing is that Fascism tends to be militaristic and expansionist. They always pick a group as a foe and discriminate against them harshly . Spain if you were seen as leftist , Italy Arab, Portugal African etc. Not being as bad as Hitler is not a compliment , no western country is going to ally with them unless Stalin starts it and looks if he will keep coming West. Fascism was hated in the free world long before people knew about the camps.