"Sometimes kids are complete idiots"... so definitely ban their social network but keep yours full of phony influencers and extreme politics - because the adults are never complete idiots...
It’s not “their” social network. It’s the CCP’s. They have never lacked for a social network. They will simply migrate to YouTube, Instagram, whatever. They will not hurt one bit for expressive capability. No one is being censored.
This is like banning a specific blend of woodpulp for making paper. There are other papers.