No, but seriously. Is the platitude true? I say no. I say the statement "ignorance is bliss" is only as true as the statement "McDonald's is good for you."
Reportedly they've stripped the analogy section from the SATs, but let's give this a shot. (To begin with, let's just be clear that by "good for you" I mean healthy & nutritious. I always used to insist that bacon, egg, and cheese sandwiches were "good for the soul"; I don't want that manner of nonsense gumming up the analogical works.) So in what sense is McDonald's good for you? It's all about context. If the alternative is toxic waste, or if there are no alternatives, then sure, a Big Mac is manna: anything edible is indubitably* better for you than poison or starvation.
Similarly, ignorance can be said to be bliss in that it means, by definition, that we ignore painful facts.
Bliss is pretty much the same word as
blithe,
it turns out, and
blithe of course is an adjective meaning "heedless, careless" (Oxford English Dictionary), or "showing a casual or cheerful indifference" (Oxford American Dictionaries)—i.e., in a very basic sense, ignorance and bliss are linked by etymology, but the bliss in question is all
about disregard for the facts: casual and careless. As discussed
elsewhere, happiness originally has to do with good fortune (in the sense of luck or fate, not [necessarily] material wealth), which means that happiness and bliss are not necessarily allied: bliss could accompany senile delusions in the face of total ruination, whereas happiness (in its fullest original sense) could not. One simple answer, then, is that
ignorance may be bliss but not happiness. But I think there's more to it. I'm sort of mixing metaphors here (more like mixing levels of etymology), so let's step back. The way in which ignorance can lead to bliss is the way in which bliss implies a lack of regard for the world around you. And... Hell, let's write this the way Plato would've.
SOCRATES Imagine, if you will, Testicles,** a span of desert cooked to burning by a merciless sun.***
TESTICLES Very well.
SOCRATES And—hell, let's throw in a dinosaur, too, who will eat you if you do not find shelter.
TESTICLES Terrifying, Socrates.
SOCRATES Imagine, now, a cave: neither the sun's brutal rays nor the dinosaur's ravenous jaws can penetrate its opening, and inside, too, is a cool, clean stream. A-and a refrigerator.
TESTICLES A what?
SOCRATES No matter: food, Testicles, let us imagine that there is an endless supply of food in the cave.
TESTICLES Where does it come from?
SOCRATES It doesn't matter, hydroponics or something. The point here isn't strict realism, Testicles; we're constructing an analogy.
TESTICLES Very good, Socrates.
SOCRATES You'll agree, Testicles, that it would be preferable to reside in this cave of good fortune rather than to die in the desert, roasted by the sun or devoured by the dinosaur.
TESTICLES Certainly.
SOCRATES Imagine, then, Testicles, that you are not in the cave—but nor are you in the desert. There is another cave nearby, a smaller cave, that also shields you from the sun (although at certain hours its light does creep rather perilously close along the floor of the cave toward where you lie) and keeps out the dinosaur (although he can wedge his face in there fairly well and thrash his nasty tongue quite horribly close to where you cower); it too has a stream (although not so cool and not so clean as the other—gives you the shits now and then, I'll be frank), and it too has food (but no refrigerator).
TESTICLES No what?
SOCRATES You will agree, Testicles, that this cave, though superior to the desert itself, is a poor substitute for the cave of good fortune.
TESTICLES Without doubt, Socrates.
SOCRATES And you will agree as well, good Testicles, that to switch caves might be advisable.
TESTICLES I would agree without hesitation, Socrates.
SOCRATES Even to cross the desert, to endure the sun and to face the dinosaur, would likely be a risk worth taking, to change caves.
TESTICLES Well, let me think.
SOCRATES Just say yes. I'm not paying you by the hour.
TESTICLES Yes, Socrates, absolutely.
SOCRATES You might face hardships while crossing the desert to the other cave, but upon reaching that cave you will have better shelter than you would if you remained.
TESTICLES I would not disagree, Socrates, even if I were thinking for myself.
SOCRATES Well, then, what would you say if I told you that the desert is the pain that knowledge can bring, that the lesser cave is an escape from pain through ignorance, and that the greater cave is the conquering of pain through greater knowledge, the state that mankind can reach upon successfully processing and coming to terms with the truth? Set free by it, as the apostle said?
TESTICLES [gasps, applauds]
SOCRATES And what would you say if I told you that your card is the queen of spades...and has been in your left front pocket all this time?
TESTICLES [marvels, cheers]
SOCRATES And what would you say if I made this hourglass...DISAPPEAR?
TESTICLES [screams, head explodes]
Hm...not sure how helpful that was. My point is simply that ignorance may mean the avoidance of pain, but there are better ways to be happy than merely to avoid pain. It is better, for example, to come to terms with loss than to go on blithely imagining that you have lost nothing. I realize that I have simply asserted something and have not proved it: plenty of people believe that you'd be just as well off a brain in a jar, that lies are as good as truth as long as they are not exposed, that perception is an illusion and consciousness a curse—all of which essentially mean that life is in no clear sense preferable to death, and even Camus saw life as preferable to death (at least until he drove into a tree). Maybe as a general rule we're better off articulating our positions in themselves rather than setting them against others in some kind of ideological deathmatch. Either way, I'd rather eat McDonald's for breakfast, lunch, and dinner than to die of hunger, and I'd rather not face a painful truth than be destroyed by it. But McDonald's is not the only source of sustenance on the planet (for now), and most painful truths do not destroy us. Ignorance isn't bliss: it's just better than agony.
Respek.
* I can't actually use this word with a straight face. Here's why:
** Rhymes, sort of, with Sophocles. Yes, I am 12 years old. Have I denied it?
*** I haven't read Plato in more than a decade.