After killing an officer, the waiting for surrender bullshit goes straight out the window.
If you kill, you should expect to be killed, end of story.
No, thats wrong. American police aren't to kill unless they out of options (which is what started this mess in the first place..) Were they strategically out of options at that point? There are lots of details still missing from the public eye. Why didn't they try knocking him on his ass with a stun grenade taped to the bot? Maybe send in a few of these and knocking him on his ass and waiting until he was out of ammunition or physically unable to attack? Lots of questions remain on why he was killed this way.