You have a lot of this right but I think you hold out hope for the impossible.

"The planet is at risk, and time is short.

The lines need to be drawn, and those infected with alien destructiveness must be removed from authority over the rest of us. Those who have become irrational must also be prevented from destroying the planet out of insanity or greed."

It is not the planet that is at risk. The planet will survive, most likely even humans will survive. If we don't evolve society to a more sustainable and equitable society then a lot of people will die, wars and famines will spread and the habitable regions of the planet will shrink and likely evolve to despotic rule. I can say what dystopian path society will follow but it is almost certain it will not be the utopia for which you hope. Any sort of commons that is restored will not be a global one but isolated ones. Maybe some will be democratic or communes but most will likely be ruled by violent authoritarian strong men, probably some will be white supremacists.

It is not hard to imagine those with power will identify the areas that will benefit from climate change or at least be the least damaged. They will migrate first and establish control in those areas. When others follow them they will be screened. Not everyone will be welcome. Seriously we already see migration being controlled, few of those migrants are true climate migrants but they will become more numerous. The cost for accepting migrants will only become higher and the resistance to migration will become greater. This will lead to violence as being denied migration will be a death sentence. We are just seeing the tip of this iceberg.

TEK