More pointedly: the capacity of our society to graciously absorb climate refugees of every sort is very limited. NIMBYism is a very poor predicate for accepting large numbers of displaced and relatively poor migrants.
C.f. attitudes to Dust Bowl farmers for one precedent.
A friend pointed me to Chico (CA) as an interesting test case. The rapid shift from gracious "Christian" charity to increasingly right-wing hostility, in the face of large intake of people displaced by wildfires (or fear thereof), is a canary.
It is a good time (now) to contemplate how this is going to amplify Fox-fueled xenophobia, tribalism, dehumanization of political opponents, and increasingly open organized domestic terror and violence in de facto Brown Shirts.
The Water Knife is a mediocre novel, but a relevant sketch of how bad things might in theory get, wrt water in the American west should aridification accellerate. As it may well.
It's not too early to begin organizing a rational response. We prepare for earthquakes; this one is all but certain.