First, driving a near-empty bus around town does not save fuel in any way, shape, or form. It wastes fuel because the passenger mile per gallon falls below that of a Hummer.
Second, the fact that you may have to use 20% of your income on transportation to and from work is YOUR problem. It's not the taxpayers' responsibility to shield you from the cold, hard realities of your economic life!
Where did we ever get the idea that society is here to shield poor people from the realities of poverty? We should subsidize fares for people who spend their money on cellular phone bills, cable with high-speed Internet, and a new HDTV? You offer a prime example - the government should raise my tax rates to keep the fare low for you....while you own a car?
Sell your car and pay your own way through life!
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