Is it better to be happy, or informed?
- John Stuart Mill
- Thomas Nagle paraphrased :)
Ignorance is bliss. Personally I'd rather be informed, that way when I do have the power to exert a little influence (such as in the voting booth) I'm more likely to make a decision that will steer away from more mess. Even so that almost always feels like decisions between various grades of bad rather than something good.
A casual Google search says that "happy" == "feeling or showing pleasure or contentment".
The more informed you are, the more problems you will see and the less content you will be with the state of things. Problems aren't particularly conducive to happiness.
That said, ignorance is not necessarily bliss. It is better to be informed and be able to protect oneself from possible problems than it is to continue to pretend everything is fine and fall victim to eventual problems.