We're learning.  We know a hell of lot more today than we did a year ago.  Sure, we have a long way to go, but we will never know everything there is to know about every issue that affects our lives.  This sort of unproductive nihilism is silly.  We will continue to learn more, and always try and make the best, most well-informed decision that we can.

If your point is that we all have a duty to learn and become the most well-informed citizens that we can be, then I say bravo.  If your point is that we should throw up our hands in disgust and quit caring about public policy alltogether, I say you are wasting my time.