LOL I knew my comment would get a rise out of Trump's fans.
Look, I don't condone this deputy's actions (or rather, inaction) one bit. But he's already out of a job, it's unlikely he will ever get another job in law enforcement, he might have a tough time getting a job, period -- especially anywhere near his current home. I don't know if there might be some sort of legal action against him and/or the sheriff's department. The guy is finished, beaten down, ruined. He doesn't need the President of the United States piling on.
Another thing: I hear this former deputy has been threatened. It is well known that a number of people from the lunatic fringe worship Trump as their god. What's to stop one of these crazies, upon hearing that his hero is displeased with the former deputy, from deciding to cause this former deputy and maybe his family bodily harm?
There are times for the president to speak out. But this is not one of them. We already know the deputy screwed up. We don't need the president to tell us, especially when doing so might get some innocent party killed.
In other words, Trump -- SHADDUP!