And YOU, very much, need to do research on the 1960s through the late 1970s! This anti-police has EVERYTHING to do with the hippies and Yippies and SDSers. Oh yes, and throw in the BLACK PANTHERS into the mix as well.
BTW...your erroneous "thirty years ago" time table, only brings us to 1976, which is a full NINE YEARS too late, for the genesis of the problem.
History is your friend...LEARN SOME!
Your math is as bad as your reasoning, cupcake