Or how about I tell you about factory farming and where your hamburger came from.

As a vegetarian, I am obligated to point out that you shouldn't have to hide torture from your kids because there shouldn't be torture. How would you like it if it turned out that your car was secretly powered by a forsaken child, but the government covered it up because it might make you depressed? You wouldn't thank them for protecting your mental health, you would condemn them for allowing a horrible injustice to continue by suppressing the populace's natural horror.

</rant>

Ahem.

You're absolutely right, concealing lovecraftian mindbreaking knowledge is a good thing, because duh. Thank you for pointing this out, it's easy to forget "what we should say" is not the same as "what we should believe".