[uabstraction]

You either approach it from the social perspective, or the utilitarian perspective. From the social perspective, the goal is building a community. To build a community, people need to be held accountable for antisocial behavior. The technology is secondary.

Most of the times leftist communities split off from mainstream platforms, it is because the platforms either enable rampant antisocial behavior, limit the community's autonomy in deciding how to deal with it, or its just plain censorship.

The libertarians see it as a utilitarian problem. Banning any content or behavior is beyond the pale, and they try to build out their technology to ensure this "marketplace of ideas" prevails. They consider themselves rugged individualists, so the goal of building a community is an afterthought.