Is stubbornness really the core of climate social problems?
A somewhat analogous case study would be racism in the U.S. Racists were extremely stubborn about giving any social space to black people only 60 years ago. But that has changed considerably since. Racists are still stubborn...and marginalized (though, less marginalized than a decade ago, unfortunately). I think the adoption of non-racist policies and their proliferation made racism less relevant in every day life. Racists could be as racist as much as they wanted, but it just didn't matter. Black folks worked at the front of the bank as bank tellers rather than janitors.
Similarly, I think industrial policy that favors rapid proliferation of climate friendly...stuff is our best bet. Let coal rollers roll coal. If a bunch of people try for net zero or really try to reduce their carbon footprint, rolling coal just won't matter. Activity at the scale of a whole population makes individual activity superfluous in this case. Economic incentives matter and prudent people will generally try to save money rather than go broke out of pride.
In contrast, I think psilocybin reinforces the narrative that we're individually responsible for climate change. It would also be immediately rejected by conservatives as population control. It seems like a good idea if you assume everyone does it. More than likely, that will not be the case. And it'd be unethical to trick them into ingesting it.
I don't get this. This sounds like people were there for a job, but otherwise harbored no ill will towards the enemy. Or maybe they did, but it being Christmas and all, they really just wanted to carol and smoke cigars? What was the point of going back to the war with someone you just sang carols and smoked with?