Okay, so, you build 5, at first, then 15, hyper-expensive space ships to go to a place you can't live on without major re-engineering and expect it to be the new 'cradle of civilization', especially when you don't bring the one person expected to 'fix' the planet.
The first ship was supposed to take years to arrive, and the later ones were equipped with FTL, meaning they would arrive years before the one with the guy who was the genius expected to make the planet habitable. To quote Tony Stark, not a good plan. And then to waste all the materials on the multiple ships left dead in space because of your weapon. Worse plan.