The feature you're proposing would be contributing to polarization. By vanishing those voices or opinions one doesn't like, one tends to become more confirmed in their own views, and this actually pushes groups further out to extremes they might not have gone to before. Here's a good article on this:
"Belief polarization is the cognitive phenomenon by which interactions with like-minded people transform us into more extreme versions of ourselves. To put it another way, when we talk only to others who share our views, we each come to hold more extreme versions of those views. Yes-men, groupthink and echo chambers can radicalize us."
https://www.discoursemagazine.com/ideas/2021/01/26/the-polarization-dynamic/