Because they know that since they have managed to convince the average Dem Party voter to never, EVER question anything they say, there is absolutely no chance that THEIR voters will suddenly begin thinking independently of the political propaganda.
WHY IS IT DEMOCRATS SCREAM DEMOCRACY IS UNFAIR AND RACIST WHEN THEY ARE NOT IN POWER? AND WHEN THEY ARE IN POWER, THEY SCREAM DEMOCRACY IS UNDER ATTACK BY UNFAIR RACISTS?