The two (realism/knowledge and depression) seem to be in a feedback loop. Probably children are happier because they dont know enough yet. And fools/ignoramuse

The two (realism/knowledge and depression) seem to be in a feedback loop. Probably children are happier because they dont know enough yet. And fools/ignoramuses - that conventional wisdom has some merit. It's a question though why humans would evolve to become inert in the face of knowledge. Who knows, it may be an advantage.