The notion of "post-truth politics" is one of the major issues of the day. "Everyone knows there are facts" is not actually a given in modern discourse.
As it should be, with a fact check (at least if the fact is demonstrably false).
"Debates" (insofar as that concept even exists on a platform like Twitter) started on false grounds should not be allowed to continue.
If I make a claim "A, therefore B, therefore C", and A is demonstrably false, I'm not going to insist we keep discussing B and C for the sake of not "ending the debate". I should be forced to either concede or find a new line of reasoning.
