Fascists will always use a crisis to gain more power. If the Rechstag fire had actually killed Hitler, then yeah, it probably would have been a good thing. But in the end it didn't, it just gave Hitler more power. This situation with Trump isn't much different.
Granted, hindsight is a big factor here. But I think I've made my point.
Trump burying news about him with more news about him is to his advantage. And I guarantee you Trump will continue milking the assassination attempt. It isn't buried by a long shot.
If Trump were to trip down the stairs and break his neck, that would be one thing. Becoming a martyr is another. And becoming a martyr while still alive is even worse.