That's not my point. Obviously people will move away on their own accord if living in a location is no longer safe/viable. My point is, until a location is no

That's not my point. Obviously people will move away on their own accord if living in a location is no longer safe/viable. My point is, until a location is no longer safe, they will generally stay put and resist any pressure to leave, even if all evidence points to it becoming unsafe in the not so distant future. Elected officials live in the moment, and will not make decisions that impact constituents today in preparation for a future disaster.