I originally saw this song as a sarcastic comment on the typical PC attitude that we can't judge those who are less than us, or that disabled/primitive people are actually happier than the "enlightened" or "evolved" types. The "Happier than you and me" lyric especially references this. Think of anthropologists who claim that people are happier in primitive societies, because they are blissfully ignorant of the worries of the post-industrial world and have less to think about, because they're concentrating on the day-to-day labor of just staying alive. "Determined what he can see" refers to the fact that the Mongoloid had a limited viewpoint that made him happy. Thinking of "simpler" people as happier discounts the fact that, despite their happiness, their simpleness is still a defect -- at least from our viewpoint. Mongoloids and primitive people have a shorter lifespan and are less equipped to deal with the misery that they do face.
You could also interpret this song much more simply and say that it's just a statement that ignorance is bliss, and if everyone is ignorant, no one will know you are, etc.
I originally saw this song as a sarcastic comment on the typical PC attitude that we can't judge those who are less than us, or that disabled/primitive people are actually happier than the "enlightened" or "evolved" types. The "Happier than you and me" lyric especially references this. Think of anthropologists who claim that people are happier in primitive societies, because they are blissfully ignorant of the worries of the post-industrial world and have less to think about, because they're concentrating on the day-to-day labor of just staying alive. "Determined what he can see" refers to the fact that the Mongoloid had a limited viewpoint that made him happy. Thinking of "simpler" people as happier discounts the fact that, despite their happiness, their simpleness is still a defect -- at least from our viewpoint. Mongoloids and primitive people have a shorter lifespan and are less equipped to deal with the misery that they do face.
You could also interpret this song much more simply and say that it's just a statement that ignorance is bliss, and if everyone is ignorant, no one will know you are, etc.