Because this kind of feather-ruffling is something which very easily could become one of those "I thought he was reaching into his waistband" shootings that provoke major riots.
A smart cop would simply respond very neutrally to the "dumb-****'s" questions as he's writing the summons, hand the summons to the "dumb-****," and say goodbye.
Your severe emotional reaction doesn't make it so. You've obviously been played by the media. A few cases with 1 million cops on the street and you're pissing yourself over my gosh what could have happened.
The question was answered, obviously the asshole wanted to make more of it and because HE might misbehave it's somehow the cops' fault if he gets shot? How ******* stupid! Put responsibility where it belongs. If asshole wants to escalate the issue because he didn't like the second answer to his stupid question then good riddance, we don't need him around.