•Let's learn about the history of torture! Or how about I tell you about factory farming and where your hamburger came from. Or poverty!

I don't think this example is in the same class as the other ones...as in, there's a certain age at which I would think that it is a good idea to tell your child, at the very least, that torture/factory farming/poverty exist. Preferably in a "let's think of something small that you could do about nasty situation XYZ" format. I wouldn't recommend telling 4-year-olds about these things-they aren't at an age to understand them-but 10-11 year olds is a different story. To do otherwise is to raise children to unconsciously ignore these issues, as most adults do. These issues exist.