Should the government assist or are you of the opinion that it's just bad luck that they need to deal with on their own?
Personally I think the most rational option would be for the government to build non-profit apartment complexes across the country, but localized in areas that are projected to be safe for 100+ years where affected families could be relocated. I don't think they should be pumping money into rebuilding homes in the exact same vulnerable location though - I don't know if that's happening or not.