You look at isolated incidents where likely the higher ups in the force are bought out. Then you apply it to every individual and the profession in general.

But destroying your 100% anti-cop argument is simple enough. We've already seen what happens when cops aren't allowed to do their jobs. In Portland. In San Francisco. In Seattle. Their job matters and it helps society. Any sane person would rather have a SWAT team than nutters running free on the streets.