Argument is an art of rhetoric, not logic. Many very smart people make flawed arguments, sometimes instinctively, sometimes deliberately.
I'm not saying they should. In fact, I'll now say: they shouldn't. But whatever defect this habit is evidence of, it isn't necessarily a defect of their intelligence. Sometimes, but not always, or even usually.
https://en.m.wikipedia.org/w/index.php?title=Logical_truth&d...
https://iep.utm.edu/gettier/
For example:
https://en.m.wikipedia.org/wiki/Trickster