Seriously. Just stop. What's amazing to me is we didn't see this as wrong even then.
Seriously? Are the illustrations not in keeping with all of the other illustrations he has ever done? Caricatures are not in and of themselves offensive without context. I grew up as a kid in a racially diverse neighborhood where ethnic stereotypes were frequently used. It was never what was said but how it was said and how it was intended to be taken which determined if it was familiar affection from a place of love or fighting words.
So, no. It's not amazing to me that we didn't see this as wrong even then. In fact, the fact that you see it as wrong now and not then says more about how you have been conditioned to find insults in everything even the things that were never intended to be insults.