Actually, I do know why. It's a depressing disenchantment with government.
They don't understand that government is not going anywhere, and that government can be as good as it can be bad.
The quote zmblum posted is brilliant, and it is an example of what Good Government is capable of. It is not just for your 5th grade civics class. It's for RIGHT NOW. Read the quote, understand and respect it and its authors, and take action. The government is not just them, it's also you, and sitting on the sidelines being cynical is supporting them.