The Strugatskys write that those left behind found this unpleasant:
«In fact, it looks as if humanity is splitting into higher and lower races. What could be more repugnant? Of course, this analogy is superficial and fundamentally incorrect, but you cannot escape the feeling of humiliation when you think that one of you has gone far beyond a limit insurmountable for hundreds of thousands. …Humanity, sprawling across a blooming plain under clear skies, surged upward. Naturally, not as a crowd, but why does this upset you so much? Humanity has always advanced into the future through the sprouts of its best representatives.» (The Waves Extinguish the Wind)