If Trump didn’t say anything, this would be a non-issue. At some point, MAGA needs to become a real movement beyond Trump, and not primarily a cult of personality.
While Trump still has one run left, he also needs to have a heir apparent. By attacking perceived competition, he limits MAGAs future success.
He’s not attacking Kari Lake. Desanctimonius has an attack squad after Trump right now. He’s pretending to be above it all but he knows as much as anything that his silence is his acceptance of the tactic.