I know police are unionized which makes their inaction even more puzzling to me. You'd think there's a threshold that could be reached and at which point, they'd take action to protect their interests. Maybe not.
If their recent treatment didn't breach any threshold, I don't know what would.
To answer your question, you need to realize that their Union is a political entity with a political agenda.
Which political party is in bed with the Unions?
Which political party has lost power and influence, since Donald J Trump was elected?
Which political party has spent the last 4 years using law enforcement to overthrow a duly elected President.
Which Political party can not afford another 4 years of Donald J Trump.
Which political party benefits from civil unrest and distraction under Donald J Trump’s watch.
Which political party are the Unions beholding to?
There is your answer, pure, plain and simple.