It's entire predictable considering the story such people sell. Not insane, just common sense.
When a person advertises himself as attacked, and one attacks him, his sales pitch is confirmed and he has more fodder for his ads.
Over and over there has been this rush to attack Trump in exactly the ways that play into his hands, into his rhetoric. He WANTS that, because without it people might see how hollow he really is.
People have to decide for themselves which is more important, going through the motions of an indictment or trying to make him go away.
The phrase cutting off the nose to spite the face always comes to mind.