I respectfully disagree. Trump should not let it go. It should be one of those "presented without comment" things. Bring it up, over and over, then let the audience fill in the blanks.
The problem, of course, is that Trump has difficulty presenting things without comment.
Let him comment this is a Damn mass murderer.
And have it dominate the news cycle for a week?
I don’t think so. Don’t fall for the bait.