Yes, one SHOULD; but we are talking about leftist supporters; and they are faithful to Dem Party political propaganda to the point that mere facts and evidence mean absolutely nothing to them.
Fortunately for their peace of mind absolutely every time they or their warped and sick and twisted Party turns out to have been monumentally wrong they instantly and collectively memory-hole the event and then clutch the next political propaganda lie to themselves as if it's the Holy Grail.