I don’t understand American law super well, but it’s hard for me to believe that they aren’t protected by laws that allow them to do a lot of things that ordinary people couldn’t. There’s no reason to think this change will increase the number of lawsuits against police officers, it may even decrease them because if the cop is at fault and not the department it might not make sense to sue if the cop doesn’t have the means to pay.
I agree, though, that you’d want police to have options to get a legal defense free of charge so that cops who haven’t done anything wrong don’t have to fear frivolous lawsuits. (Then again, I’d like that for everybody)