How can we be trusted to vote?

I want to see us get back to our founding principles instead of continuing down this road where Government makes more and more decisions that individuals should be making for themselves, from the cars we drive to the size soda we can drink, to the light bulbs we can use.  Soon, Governments will be like they were in the past (and like they still are in many Countries around the world today) all powerful, where our rights are given and taken away at the will of the governing elites.  How can we be trusted to vote for our leaders when our “rulers” cannot even let us decide what size soda we can drink?