I’m not sure I follow this line of thought. If all the grocery stores did this, then I agree society would certainly take action: build better, more open grocery stores. surely the same principle applies here, A business like Twitter can choose to block a group of ideologies. If there is enough want in the part of people to propagate those ideologies, they’ll build a better forum and if those ideas are successful, that forum will be. Competitive, capitalistic behavior handles this.