The biggest problem is that we get so many videos which show police abusing powers; but we never get to see all the times that they are there to protect and help people, how many drunk people they take home to keep them safe, how many kids they stop drinking on street corners and ruining their lives, how many people the save from other hideous crimes.
They do have to have an understanding of the law also, however they need to be trained better in exercising it.