> Opinions like this are dangerous for intelligent people.
I also want to add this was quite rude and conceited.
Personally, I didn't interpret the poster's opinion as rude or conceited. This is hacker news. It attracts a demographic of intelligent people who are used to seeing the world without blinders on. It makes sense to me that someone who identifies as a "hacker" would be offended by the idea of withholding information.
The truth is, when we do a careful autopsy of old people who died of non-cancer diseases, we usually find a ton of hidden tumors that have just quietly been lying dormant, not really harming them. In those cases, ignorance is bliss because doing anything to remove the tumors only could have increased their risk of death given that the tumors didn't kill them.
We don't know what bucket of people any one person is in, we can only look at overall statistics.