Well if people were not just coming up and shooting at them they wouldn't be so nervous.  You need to put yourself in the cops shoes.  You have someone approaching you kind of fast, with a metal pipe moving their hands all around.  You don't know this person, you don't have a clue if he has a history of violence or not. You know someone is coming at you.  What do you do?  Sorry, but its very sad this happen but this cop was protecting himself.  I cannot blame him.  Let the bashing start!!!!