Philip Nel, a Seuss scholar (yes, there is such a thing): “Yes, there are some examples of him revising in response to criticism, and you can give him credit for that — but I would only give partial credit! … I think what is surprising to people is that this was a guy who throughout his work tried to do anti-racist stuff. Think of Horton Hears a Who — one reviewer who read the book when it was published [in 1954] described it as an argument for the protection of minorities and their rights. … [But] Seuss wasn’t aware that his visual imagination was so steeped in the cultures of American racism. He was doing in some of his books what he was trying to oppose in others.” – Slate