This isn't their first catastrophic flood. There was one in 1916 where the entire area was destroyed just like now and they rebuilt. They didn't have FEMA back then or all the resources we have available today.

https://www.cbs17.com/news/north-carolina-news/hurricane-helene-asheville-1916-flood-worst-disaster-western-nc-history/

Considering the mindset of the people that live there, they will rebuild their community with or without FEMA's help.