Trump compares cop who shoots a man many times in the back to a golfer who misses a putt: How can the President's speech be justified?

https://www.cbsnews.com/news/trump-compares-cops-golfers-choke/?ocid=uxbndlbing

Daily, the President says stupid things, and this has to be one of the worst. Why do his handlers let him say unscripted things? How can his comments be justified? Am I missing something?