I see no reason to ban discussion of the Holocaust, the shape of the earth, or any other secular/historical/scientific topic not decided on infallibly by the Church.
It would be hypocritical of me to criticize the Jews who say we can't investigate the claims of the Holocaust, but darn it, Thou Shalt Not discuss the shape of the earth on CathInfo!
Sorry, it goes against my principles to ban discussions for no good reason. If someone gave you a verbal boo-boo, just avoid that subforum in the future. I've taken measures now so that Flat Earth topics won't be "in your face" all the time, on the home page. They will only exist for those who click on that subforum now. You have to enter the Lions Den to see them now.
We have to assent to the dogmas of the Catholic Faith. Beyond that, discuss away and have your own opinions! Just keep in mind they are just that -- opinions -- and you can't bind them on others, much less under pain of mortal sin.
You're not the Pope, after all!
PS. That doesn't include the Anonymous subforum, however. Discussion of Flat Earth is limited to the Flat Earth Subforum ONLY.