To some extent, the Democrats are playing chicken with Trump's eventual re-election. They don't want to actually "seize" power in the same way that Republicans do. They want the pendulum to swing back and forth so they can keep getting re-elected and keep playing that old game of kickball with Republicans. Dems win some. Republicans win some. Everybody gets to complain about the opposition and do nothing. That Republicans seem to be updating their modus operandi from playing kickball to playing what seems to be "king of the hill, but with knives" has not quite dawned on the Democratic party collectively yet.