This is an entertaining (and often exasperating) decades-old trend in competitive U.S. college debate, as well.

A common advantageous strategy is to take the randomly-selected topic, however unrelated, and invent a chain of logic that claims that taking a given side/action leads to an infinitesimal risk of nuclear extinction/massive harms. This results in people arguing that e.g. "building more mass transit networks" is a bad idea because it leads to a tiny increase in the risk of extinction--via chains as silly as "mass transit expansion needs energy, increased energy production leads to more EM radiation, evil aliens--if they exist--are very marginally more likely to notice us due to increased radiation and wipe out the human race". That's not a made-up example.

The strategy is just like the LessWrongers' one: if you can put your opponent in the position of trying to reduce P(doom), you can argue that unless it's reduced to actual zero, the magnitude of the potential negative consequence is so severe as to overwhelm any consideration of its probability.

In competitive debate, this is a strong strategy. Not a cheat-code--there are plenty of ways around it--but common and enduring for many years.

As an aside: "debate", as practiced competitively, often bears little relation to "debate" as understood by the general public. There are two main families of competitive debate: one is more outward-facing and oriented towards rhetorical/communication/persuasion practice; the other is more ingrown and oriented towards persuading other debaters, in debate-community-specific terms, of which side should win. There's overlap, but the two tend to be practiced/judged by separate groups, according to different rubrics, and/or in different spaces or events. That second family is what I'm referring to above.