Trump needs to keep hammering on the murder in San Francisco (and other like it) and keep exposing that if you aren’t part of the solution (border wall) ...you’re part of the problem
Precisely correct.
This is an area that could be Trump's downfall. He has questionable message discipline. Moves too quickly to the next shiny object. Kills it, moves on.
He needs to spend more time and energy on each victorious message.