from a sufficiently misanthropic perspective that global human over-population is "the problem" , both methane release, civilisation collapse, and lack of budget to maintain or build infrastructure and systems like healthcare all sound like they are part of the "fix".

I don't really think it's helpful to talk about "the" problem, there's a big mess of coupled systems and most "moves" available to us have unpleasant side effects or unknown side effects on global or long-term time scales. we have a limited time and resource window where moves are still available.