Some sorts of goods should be prioritized over some sorts of bads. There would be no terrorism if we locked every human in a box and kept them there, yet you do not support this position, why? I jest, but I think public discourse is an unalloyed good and I would rather we not compromise informal small discourse for the sake of anti-terrorism, anti-CSAM, etc. These things won’t be fully rooted out, they’ll just go to ground. Discourse will be harmed though.