They never did figure it out. They had to be told. Conservatives are really bad at seeing the obvious much less any level of nuance.

Pick up a US or World Hstory book as an adult and two things will dispel the illusions you may have about Americans and the human race: First, the rest the world hates us for very good reasons, and the things we did on a smaller scale in previous centuries are now much more widespread. Second, our species is infinitely more capable of evil than you were made to understand.