It's a psychologic trick - appeal to extreme [1]. By constantly discussing a scenario which is so completely unlikely to occur, it warps the discussion into thinking that that extreme is somehow representative of reality.

It's a fallacy because it's like a DOS attack on the argument - burning up most of the time on a absurdly small probability. Participants and viewers tricked by thinking "what's discussed most is what's most important".

[1] https://www.logicallyfallacious.com/tools/lp/Bo/LogicalFalla...