> consistently documented as a breeding ground for extremism and linked to multiple mass killings
Like churches? Maybe the problem is that 4chanism isn't a recognized religion.
Extremism is so relative and not universal that I can guarantee that the use of edgy language and some aneurotypical behavior is the least weird and destructive thing going on in our world right now.
For instance, antinomianism isn't just tolerated in the United States, it's taught and embraced at a level that the people who believe it don't even know the word for it. However, there's nothing more extreme or terrifying than people who live under the belief that nothing matters in life as long as they fulfill the mission of their faith because their true and eternal reward only comes after.
From those oddball Christian big game hunters seeking to prove that "God gave man dominion over animals", to companies that don't care about pollution because not producing to the limit of their abilities is wasting a gift from God, to the Hobby Lobby family funding ISIL by buying up ransacked early Christian artifacts, to child brides and arranged marriages in sleepy little towns across the country, there are people who are brainwashed into believing they're in a fight or die battle for their souls over things as non-controversial as celebrating certain holidays, bodily autonomy and consensual relationships, having equal healthcare access, upholding separation of church and state, or ensuring access to quality education.
On the other side of that coin are people who believe everything is okay as long as you or someone else is paying for it. It's a different type of religion and no less cruel or violent.
Not that they're harmless, but I'm not afraid of Pepe memers. I'm afraid of raising my family near a future Superfund site, that kids are growing up being better prepared for mass shootings than to succeed in college, and for anyone nearby when some cave dweller opens fire or sets off a bomb at a women's clinic.