> This is a common error in reasoning by the way: looking to the way current law happens to be and inferring from that what the right thing to do is.
I understand this, and the understanding is implicit in the way I phrased: "our society has agreed that we shouldn't force people to change their religion." It's also worth noting that "religion" here usually refers to practices and beliefs that don't infringe on other people's rights. To evaluate whether these practices infringe on someone's rights, one should take into account their protected classes: i.e. you're not allowed to discriminate against a person's skin color even if your religion says that you should.
Our society has also agreed that certain beliefs are reprehensible and deserve no place in society: both major political sides think that advocating for violence is unacceptable, and therefore both the Democrats and the (centrist) Republicans cannot claim that private companies who refuse to host a platform that allows calls for violence are unjustly discriminating — if the politicians want to be logically consistent. (This is what I meant by "When your political beliefs include inciting violence by spreading unfounded conspiracy theories, then private companies have a right to kick you off.") This is a positive statement, not a normative statement.
Normatively, alt-right beliefs should not be given the same protections as religions because they infringe on other people's rights. For example, repeated, false allegations of voter fraud indirectly infringe on people's right to vote because they effect court cases that call for legitimate voters to be disenfranchised.