Goes back farther than that. After WWII the whole Western world went through a wrenching examination of how it came to apocalyptic fascism. Everyplace, not sparing Britain and France, discredited the right for the next half century. Everyplace, that is, except the US.
Saw this firsthand with my German bride in the 80s. To me, the state police were the Bull Connor types who beat up and sheep-sheared anybody they thought was a hippie. To her, they were like the mailman, and often had long hair themselves.