In my opinion, the primary reason Western culture infantilizes itself is because it refuses to address racism in any serious way. Rather, Western culture insists on looking the other way, insisting that it is not racist, that racism no longer exists, and so on. Read the book, White Fragility (or just read the New Yorker article here, https://www.newyorker.com/books/page-turner/a-sociologist-ex...).
Here's a thought. Suppose, just for a second, that racism is, in fact, cruel, absurd, and has no basis in science whatsoever, pseudointellectuals like Sam Harris notwithstanding. (Some of you will have to take quite a leap of faith to suppose this seriously; others, not so much.) If someone avoids something cruel and absurd, what happens to this person? If a traumatized person -- and racism, to all colors including white, is cruel, absurd, and traumatizing -- does not address their trauma, what happens?
The person regresses.
It is very simple psychology, and I cannot believe this great country of innovators and geniuses have still failed to understand this.