Police unions nationwide are probably a net negative I'd agree, but claiming that good departments wouldn't have any union at all seems a big extreme. Public service employee unions are pretty normal in the US.
Because the bad cop goes to jail and now he's no longer in the department, so the department falls out of the news cycle. I'm not sure what else you'd expect...
Here's a possible example of a couple bad cops in what could be a good department: https://www.independent.co.uk/news/world/americas/crime/offi...
https://www.prisonpolicy.org/blog/2020/06/05/policekillings/
We do, sometimes. Instead of getting the presidential medal of freedom like they deserve they are forced to suffer.
The system is broken from the top, can only be fixed from the top and those on top are pretty content with the status quo.
Setting up the DHS after 9/11 was dumb but setting up a new department answerable only to the president to police the police would fix the problem.
No, it wouldn't: what happens when someone like Trump gets elected? Now the police nationwide are basically just like the SA.
I dont see an intrinsic problem with its existence.