I'm watching Live PD right now actually. I feel kind of sorry for the cops. It seems that they are constantly having to deal with crazies. I don't know how they do it and keep their cool. I could never be a cop. Lol.
I don't know what "Live PD" is but I can safely say the crazies are deliberately written into the script. If they showed a normal day on the beat they'd have no show because it would be "boring", nobody would watch (because no crazies), and then they couldn't sell face cream.