Or maybe they do think he is serious and the last thing they really want to do is jump on him because anything they say or do will keep the issue itself in the public eye — and THAT is what they want to avoid.
They are hoping upon hope that Trump just gets bored, gives up on it, and gets interested in something else. If they respond, they will just stimulate his interest even more.
It’s the MSM version, maybe if I ignore him, he’ll go away.
Trump represents American capitalism.
He isn’t moslem. Isn’t a commie. Isn’t a dirty traitor.
So if the commies (aka democrats) fight him openly, that contrast just makes it more obvious they’re commies.