The continued existence of humanity is only a good to the degree that it brings good. The continued existence of a species of psychic vampires that draw sustenance from causing pain to other conscious beings would very much not be a good in itself, and with habit and environment destruction and worker subjugation/disenfranchisement our species causes in the name of unfettered capitalism we're not so far off from that.

Big goals take sacrifice and hard work. Any cosmic human diaspora would require sacrificing earthly abundance and leisure, and the colonists wouldn't be having a good time either, so the main beneficiaries would be the billionaires and politicians that could wave their dicks around about how they're responsible for sending man to the stars.