A UI can promote positive interactions, and a moderation team can mitigate negative ones. Quite tired of hearing implications that social media platforms aren't shaping the way people communicate on them.
I.e. the app can brainwash people into reflecting some specific sensibilities. That's some Orwellian-level stuff there.
The platform shaping communication is a fact, but not a license to use it to program a worldview. The job of a general-purpose platform is to enable communication, but otherwise stay out of the way.