Those same arguments were used against freedom of religion. English Catholics were popish spies who would try to blow up parliament and overthrow the government, etc. Therefore, they needed to be persecuted as heretics to protect the common good.
Roman Christians refused to worship the emperor, destabilizing the social order, and therefore needed to be thrown to the lions to protect society.
Atheists couldn’t be trusted because they didn’t believe in hell, and therefore would act immorally, and so should be banned from positions of power (this is actually in a couple of US state constitutions!)
(And of course, the same arguments were used in reverse later on as different groups got power)
I won’t shed any tears for 8chan who are a bunch of immoral scum, but I know these same arguments will be deployed to censor religious minorities and others in the future. Hopefully they are less appealing targets.