Once you people start to understand building roads and bridges doesn't fit into the category as paying for an individual's health insurance or even giving them food stamps. Two totally different issues when it comes to central government spending.
In my understanding of the central government is, it exist to provide for things that the individual could not reasonably expected to provide for themselves. Roads, bridges, police public parks, to name just a few, notice health insurance, food, and housing wouldn't fall into that category.