The Confederacy seceded to protect their right to own slaves, and soldiers on the side of the Confederacy killed and died to protect their right to own slaves.
Not the kind of people we should be honoring by building statues and naming schools for them.
Not a great response but... Basically they are gambling they'll be dead before the bill comes due.
It helps that human made environmental changes are novel, meaning that while we have histories of other disasters befalling our planet, we haven't seen this particular one before. And since our enemy is the super rich who control much of the media output, they can cast enough doubt over everything to get away with it for long enough for them to die off.