It doesn’t matter what your stated vs. revealed preference is when that preference doesn’t matter to the status quo.
> How did every country manage to come to an agreement on phasing out CFCs?
Every country /didn’t/ come to an agreement on CFCs, that’s how. China is still emitting measurable amounts as recently as 2019[1].
1. https://www.nature.com/articles/s41586-019-1193-4
They were not more reasonable, the system and incentives were simply different. A world view where people are more or less reasonable based solely on the year they are being examined is not a world view based in reality.