That's an absolutely fair point. One thing to watch out for though, is that it's only half of the rationale behind escapism: we're concerned about our own ste

That's an absolutely fair point. One thing to watch out for though, is that it's only half of the rationale behind escapism: we're concerned about our own stewardship of the Earth, but there's a very real concern that a disaster could happen to it that's not of our own making. An asteroid, for example. Mars would protect us from several categories of these, and becoming multi-stellar would protect us from several more.