The idea is that if something horrendous happens to Earth or one of it's colonies, humanity will live on elsewhere. Sucks to be on the doomed planet, though. That's the main humanitarian flaw. The people actually living on Earth or her colonies aren't going to sit about satisfied that they are just one egg in one basket. They want to live real lives and leave a real legacy. When doom comes to Terra Nova, the people there are going to work just as hard to survive as we would on an Earth as our only haven. And the tragedy would be equivalent.
Just think about tragedy on the Earth today: if everyone on a particular continent was wiped out, how many of us would find comfort in the knowledge that there are other continents? I guess none. No, we'd have done all we could to prevent it, and do all we can to stop it from happening again. Survival by distance is not to be relied on.
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