"I just don't want to believe that anyone could REALLY be as stupid as they continually show us they are."
And with good reason, if they were really that stupid they would need 24 hour supervision by an adult. The fact is that they have simply made a decision at some point to suspend their reason and go along with the groupthink. The same phenomenon is visible in religion. How could anyone be truly as stupid as the muslim fanatics appear to be? They simply don't have the personal courage to stop the madness and use their own rational faculties. Stupid is permanent, this sort of thing is voluntary and can be terminated at will by the individual if so motivated. Almost everyone who insists on using his own brain has left the Democratic party and that is why they can no longer keep up a front of being anything other than what they are, collectivist nutcases.
I trust that you meant it isn't permanent, because you specified a reason as to why it isn't. But the liberals are willing to think that it is. They need to take their blinders off.