Even if you are smart enough to move somewhere safer (or lucky enough to have generational wealth there), you can't avoid the effects of things like refugee crises when the worst happens. If people have to leave NYC or Florida in large mass waves, that's going to destabilize in its own ways anywhere there are escaping to in large groups. There's a perspective that "nowhere" will be safe from the effects of climate change because if you aren't the ones getting flooded out (or drought destroyed or wildfire devastated or tornado wrecked; flooding isn't the only thing that gets extra energy in global climate change) and are lucky enough to be in whatever "the nice places" will turn out to be, you get to possibly deal with everyone else. (Some will make some money on that as slum landlords, perhaps, so there's a "silver lining" for disaster capitalists, but those are the same people that will be just fine turning any "nice place to live" into a terrible place for all in its own ways by preferring money to human happiness and kindness.)

America has some lovely sometimes self-delusional myths of being a shining beacon for refugees in a crisis, but anti-immigrant rhetoric is already in a bad place this decade and overall America's worst internal refugee crisis was the dust bowl of the Great Depression and it took a lot of effort and today a lot of politicians don't believe the drastic changes made to save the country from the Great Depression were good changes and have spent the last few decades rolling them back and/or destroying them and/or trying to run a Great Depression speedrun like it is a GDQ category that should have been banned pre-emptively. That probably doesn't bode well for the next crises.