http://en.wikipedia.org/wiki/File:U.S._Federal_Spending_-_FY...
65% of taxpayer's money went to defense/social security/medicare-medicaid. Think about it for a moment. 65% of the money spent had nothing to do with infrastructure. Also, do you think that government is spending all the taxpayer's money carefully OR you think that government wastes tremendous waste amount of money? There are 3 ways to spend money:
1. Your own money on yourself. [You are very careful about getting your money's worth and you do spend generously] 2. Your own money on someone else. [You are very careful about getting your money's worth but you spend as little as you can] 3. Someone else's money on someone else. [Let's burn some money to heat up the place!]
Government falls in 3rd category and it's no surprise that there is tremendous waste.
That's why libertarians are advocating 'limited government', 'minimal taxes' so that people (you and me) can keep their hard earned money for themselves and spend as they see fit.