If you had 3 kids, aged 3 to 9 and you needed a babysitter, would you even consider hiring someone who has no complaints from previous clients and a spotless record..... BUT was photographed at a NAMBLA meeting in 2014, or is on tape talking about how they like to fuck little boys/girls? Would that resume give you a high enough level of confidence in them that you'd be comfortable leaving your kids in their care?
Now consider that a babysitter is going to have a lot less chances to do anything to your kid than a police officer has chances to do things to the citizens he/she expresses hate for... and that police officer can get arrest them, beat them, shoot them/kill them LEGALLY under certain circumstances (that they can lie about if they choose, and often do and get away with), and/or be the key witness in them being imprisoned for months/years/life.
I see where you're coming from, but I'm going to turn the question back to you.
what if this babysitter had been seen it a NAMBLA rally in 2014, But realized that he had a serious problem and got professional medical and psychological help? that the reason he had a spotless babysitting record were partially the result of the years he spent learning how to have appropriate relationships with children?
The same thing applies with a police officer photographed at a Trump rally. Without the proper context you really don't know where they stand.
I knew plenty of white people who supported Trump in 2016. They dismissed his racist comments as being jokes or exaggerations. However, once he proved that his racism was dead serious and then doubled and tripled down on it a lot of them jumped ship. A few even took the time to reconsider their own personal biases and how damaging they could be.
Now personally as a father with two children between the ages of 3 and 9 I would not want anyone to babysit them unless they were a close friend or relative that I've known my entire life, or at least several years. Unfortunately, you can't do that with police. You're essentially hiring a stranger and hoping for the best.