Don't take it personally but this argument is stupid and evil beyond belief.
Without touching the economic idiocy, i.e. the incredibly large costs as well as the lack of technologies we need for such a project, setting up a colony of the moon for a few people would be pointless. Humankind is not biologically endangered, civilization is in danger. A few freaks on the moon cannot be our grail keepers.
Why evil? Because it suggests that we can really spread and that Earth-specific risks can be diversified. Sorry but until they build Yonada-like starships for billions of people we only have this planet.