[hn_throwaway_99]

Literally every (correct) example you gave is a case of people voting in their own short-term self interests, a dynamic which does not exist with global warming.

In the case of slavery, democracy didn't end this. Southern states literally seceded, and we had the bloodiest war in American history, to end slavery. And the dynamics there were that the economic systems of Northern states didn't rely on slavery, so they had little problem opposing it on moral grounds. The entire economic system of the South was built around the plantation system and slavery and so it's not surprising democracy didn't end slavery there.