Perhaps you have also heard the radio ad for a website called Stand With Cops (standwithcops.org). The purpose of the site is to encourage people to write messages of support for police.
As a kid, I was taught to respect policemen--I still do. But the police unions could sure make it easier for me to get motivated to support cops if they would stay out of politics.
The irony of the protests against the police is that most of the participants are people who vote Democrat--the liberals who think "we've got to feel sorry for these poor minorities because the cops are singling them out because of the color of their skin." Yet, ALL of the police unions support, fund and encourage their members to vote for Democrats. Be careful what you wish for.