What I find surprising is that in 1958 it was 10/60 which is a lot worse. People including myself often glorify an idea of older, pre-gangsta rap black culture. I still feel there's no way it could have been worse in the 50's.

I think police were just so much more effective back then, that even with 3% less black people (we know the pop numbers are lies but w/e) and likely less crime happening in total, they completed a higher rate of arrests. At the time police were socio-culturally healthy, in-tact, willing and empowered white men, with roots and personal investments in the places they policed, subordinate to other white men who felt the same way in a big white caring chain that only soured past redemption when it got into big money.