Why? The problem with colonization is that it disrupted the holistic growth of national communities like we experienced in XVIII to XIX century. We've "grown up" since then, recognising the competitive advantage of exploiting talents regardless of cultural provenance; but we couldn't do the latter without going through the former process and recognising its limits. Colonised countries were blocked from experiencing a similar process.

No doublethink involved, as long as you see history as a continuum, rather than believing in a fixed set of norms (typically your own, no offense) as an absolute ideal "best" transcending space and time.