It is hard to disagree seriously with what You wrote. Especially about wanting the best for any kids and further descendants. A few words about that, more a comment to threadstarter: I do not know if space activities is "worth it", if one compares with other things. Probably some, not all projects have been so.
Especially "colonising" projects sound doubtfull from my point of view(to start spending a lot of effort and money at the moment).