Almost everyone reading this probably hopes it will remain that way, even as it comes under growing pressure from encroaching greedy corporations and government regulators. People ought to be able to post anonymously if they want or need to, even to be hostile. But ultimately, this is a community, one with important information and expertise the world needs to see, hear, consider and discuss. Sites might establish special areas for newcomers, where they could be welcomed and learn the rules, traditions and language of a community before they wade in as members. Establish qualifications for membership.
Few freedoms are absolute, off-line or on.
Even in the freest society, people don't ignore traffic lights or knock down traffic signs - if they did, others would get injured or killed. Require all members to moderate discussions. If members regularly behave abusively or in a hostile way, they can be warned, then suspended or expelled. The consequences for disrupting discussions and for repeated personal and hostile attacks can become more serious than losing posting rights for a few hours. Few functioning communities in the world don't set some conditions for members.