Sad.
On the question of motive, if a person has a need to feel important, and they seek out imagined chinks in armor to attempt to exploit, as a means of advancing their delusional self-importance, the end result is disruption.
They might not view their motivation (self-importance) in terms of the consequences of their actions (disruption), but their bull-headed need to STAND BY THE "TRUTH" even when exposed to FACTS to the contrary, certainly seems to belie their stated purpose.
Did you know there is a condition known as Irrational Stubborness?
Regarding those who suffer from Irrational Stubbornness:
"Once they make a decision, it gets tied up with ego and they can become irrationally committed to it. They anticipate feeling worse if they switch and lose than if they stick and lose.""Their brains are wired in such a way that encourages them to stay with their choices, no matter how poorly informed or insignificant they are. They'd rather feel right than reconsider."
I suppose I should feel compassion for these folks. I'll work on that.