Threat is not certainty. If somebody is out there to kill you, you are under an existential threat, until they are caught. It's not a reason to start playing Russian roulette, saying "I'm already in danger, cannot get worse than that!"
>The same logic applies to shutting down oil and gas production: if we are not certain, then why risk the downsides?
You are conflating the cost of not extracting a fraction of a fraction of current production capacity with the risk ending human existence through changing systems we do not have anything close to a full understanding of nor precise control over.
Degrees of risk matter, in fact they are the whole point of GPs logic.
