Yes, the government is butting their noses into yet more places it does not belong. And it is not just our USA government. Australia and China, among others, are also doing it. For parents to restrict their child's access may indeed be on thing, but for the government to decide just what programs should be installed to block things worldwide is beyond extreme. That aside, it violates more than one part of the American Constitution - The freedom of speech. And the internet provides that more openly than any other form of communication, worldwide.
To cite a few sources:
Censoring the Internet
Australia and China