Making up events doesn't justify a shooting. He was leaning into his car. That is a fact. There was a knife on the floorboard. That is a fact. The cop didn't see a knife. That is a fact.Reaching into a car to grab a knife constitutes a threat to practically everyone on this planet except for the snowflakes on the left.
Either the cop panicked, needs more training to do his job, or he's scum.