What I'm not seeing is the problem. I'm thankful that the police did everything in their power to put the man who abducted me behind bars. He did things to me that are too awful to talk about here, you should be thankful you've never been through anything like that. If you had I think you would see things very differently.
Your logic is that cops do good things (put bad criminals in prison) therefore we should let them do whatever they want. Talk to anyone who's been the victim of police brutality, falsely accused, falsely imprisoned... and you'll see why this doesn't work.