Ignorance is bliss

Definitions:
CD: said to emphasize that sometimes it is better for you if you do not know all the facts about a situation
WD: Lack of knowledge results in happiness; it is more comfortable not to know certain things.
UD:
1. The lack of knowlege to a situation. Usually once the whole truth is revealed you realize you were happier being clueless.
2. It is a term used to falsely justify apathy on the given subject in the form of a catchy cliche. A prevalent saying of the people in North America when confronted by the truth.

Examples:
- Me: Did you know that fluoride causes bone brittleness and dental fluorosis?
  You: Meh, ignorance is bliss. *swallows the toothpaste*
- Sherry was very happy with her boyfriend.. until she was informed he was cheating on her. She thought to herself "ignorance is bliss", and broke up with him.
- Where ignorance is bliss, 'tis folly to be wise.