But don't blame them for something which is unrelated to the union itself.

There are cities where Derek Chauvin would have been on paid leave for weeks after killing george floyd.

Yes, and the police forces in those cities would all be unionized. Clearly, the issue is not the union; it is the city or county that negotiated poorly with the union. Though generally, in some states like the US Deep South, politicians are more than happy to give officers unlimited rights even without the unions requesting them.

Minneapolis had the right to fire his ass when they saw how bad a cop he was.

They fired him literally the next day. For prior incidents, none of them rose to the level justifying termination. That would have been true even in a non-union force.