Why do liberals site roads and schools as the prime examples of how taxation helps?

Only 6%(if even that much) of all federal spending goes to education and transportation.
Not to mention the federal budget for schools is already enormous, one of the largest per capita.
Update: http://www.google.com/imgres?imgurl=http://www.elapro.net/Fy2009sp.jpg&imgrefurl=http://www.elapro.net/federal.htm&h=628&w=870&sz=180&tbnid=Ax7OoFs_wz9UvM:&tbnh=90&tbnw=125&zoom=1&usg=__sL3YSIeRaYA-wgDSYCoLvuYLQF4=&docid=6SuiHkU8QydMLM&hl=en&sa=X&ei=r7UMUOWQAYiw8AS0zNjVCg&ved=0CGQQ9QEwAw&dur=236 Here's a pie... show more http://www.google.com/imgres?imgurl=http://www.elapro.net/Fy2009sp.jpg&imgrefurl=http://www.elapro.net/federal.htm&h=628&w=870&sz=180&tbnid=Ax7OoFs_wz9UvM:&tbnh=90&tbnw=125&zoom=1&usg=__sL3YSIeRaYA-wgDSYCoLvuYLQF4=&docid=6SuiHkU8QydMLM&hl=en&sa=X&ei=r7UMUOWQAYiw8AS0zNjVCg&ved=0CGQQ9QEwAw&dur=236
Here's a pie chart for all those skeptics... Yes it's huge but whatever
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