The difference is that the first can be easily rebuffed with logic and evidence. The second can too, but it's obvious that logic and evidence aren't at the top

The difference is that the first can be easily rebuffed with logic and evidence. The second can too, but it's obvious that logic and evidence aren't at the top of the agenda there. So there's no discussion necessary in the latter, and you can just shut it down. Why allow the first one then? It's about giving them enough rope to hang themselves with, _in public_. The public bit is important, because having them claim persecution and censorship, then saying those things in private anyway without rebuttable, may swing certain people.