MENSA should voluntarily shut down, for other reasons.

Nobody's talking about shutting anyone down. People can do shitty things even if they have a right to do them, and everyone else can think they're assholes. No contradictions. Same with free speech- people can say whatever they want, but if they say something that makes someone else think they're an asshole, the other person has a right to call them an asshole. Assholes are not criminals, they're just assholes and deserve to be treated as such.

I'm not sure that's a great example because its probably a better experience to be outside of MENSA than inside it.

A bit of a tangent but Mensa is not an acronym and should not be written in all capital letters. Some of their typeface choices over the years may have created confusion about this.

MENSA seems upfront about their requirements, and doesn't rely on tricking the masses to make them think they have a chance.

Amusingly, my mom and grandma were both MENSA members. My mom hated it 'cause it was a meat market. My grandma loved it for the same reason.

Discriminating on mental agility seems an eminently useful thing to do.