People get fired for saying that type of crap at office jobs, I don't see why he shouldn't be fired for saying that at an actual applicable job. I don't want to be pessimistic, but I can already foresee a "paid suspension" in the works...
Firing people for their thoughts (as opposed to the value of their work) doesn't fix anything. It just creates a culture where people say one thing and believe another.
It's sort of like the idea of kicking Trump off of Twitter. Doing so wouldn't make him a better president, it would just reduce the visibility of his grotesque thought process.
But this guy is in a position of power, that has a history of murdering innocent black civilians at an alarmingly high rate. That's the last person who should be making a snarky remark about it. It's not just having an opinion it's making light of murders committed by your co-workers.
Because we both know it wouldn't have been.