I’ll note that while the wikipedia article as you’ve linked it reads “Astroworld Festival stampede”, the page has since been renamed (more aptly, I suspect) to “Astroworld Festival crowd crush”. There’s a difference (between a stampede and a crush), and it undercuts somewhat the notion that this has something to do with the IQ of crowds. And I say “somewhat” because I think the implication that even stampeding people must be acting stupidly is problematic.
More to the point, a crowd crush may occur as those “causing” it have no clue–and indeed no reason to know–that there is actually anything wrong. More likely this has to do with some deficiency in the design or oversight of the venue.
ETA: Another example (and one where early media coverage portrayed it as due to fans getting out of control as opposed to, what it actually turned out to be, a poorly arranged/managed venue):