Unions are a right, not a privilege, and if the police and prison guards are racist, a good union representing them would also be racist.
We need to stop catering to them, however, and we need to make it those jobs fit for someone other than racists of fascists to do. But you can't create and uphold a racist system, and put all the responsibility on the hands needed to carry out the goals of that system. These horrible police abuses and prison abuses are usually being carried out under the oversight of hundreds of Democratic (often black) mayors and governors who love a docile and quiet minority population, but not the blame for the violent pacification that it takes to create and preserve one.
> It needs to be much easier to fire cops.
Unions don't make the rules, politicians doing what their donors say do. Giving the police unions what they want is a choice. Other unions don't get what they want.