Because (a) you violated the site guidelines by editorializing the title (see https://news.ycombinator.com/item?id=17147115), and (b) to do that when the subject matter is divisive is flamebait, violating the guidelines in a second and worse way. HN's rules are the way they are for good reason. Please (re-)read and follow them from now on: https://news.ycombinator.com/newsguidelines.html.

Threads are acutely sensitive to initial conditions. What you did made a very large increase in the probability that this discussion would be ruined before it began.

HN only likes science when it has PC conclusions.

For the same reason that Galilei and Copernicus came into conflict with the Roman Catholic church authorities, why Socrates was forced to drink poison for 'corrupting the youth': some ideas are not tolerated within certain societies no matter their scientific underpinning. In other words, those ideas go against the dogmata [1] of such societies.

[1] https://en.wikipedia.org/wiki/Dogma

"liberals"