I agree it is not intelligence, either. However, the comment above didn’t make it about intelligence: they called out flawed logic, and they called failure to uphold logic an instance of stupidity. Logic & consistency are more about commitment & insistence than intelligence.

Sophisticated work can take considerable intellect to produce & defend yet be maddeningly stupid in flouting general coherence & integrity. Abstract example: non-heliocentric models strained under increasingly sophisticated math (greater intellectual demand) yet are stupid compared to heliocentric models (better parsimony & more consistent with the rest of classical mechanics).

There’s also the phenomenon of smart stupidity where people (smart in specific areas) apply their intelligence irrationally: intelligence can be stupid. When people with a compatible morality arrive to unjust positions inconsistent with straightforward moral reasoning (through partiality or elaborate rationalization), some may call that flawed logic maddeningly stupid regardless of the intelligence it took to get there.

Moral reasoning takes logic, it’s not merely an exercise in empathy. Cases inevitably arise with multiple considerations where emotions conflict & not everyone can be satisfied: empathy alone will not settle them & moral judgement is necessary. Insistence on consistent reasoning & follow through despite challenges is integrity. The Milgram experiments show that even as people express empathetic distress & stall with questions, too many of them will obey orders to administer the maximum electric shock to someone they think they had shocked to unconsciousness. They had empathy & felt compromised, but they needed integrity.