If you make less than the minimum, and don't file, you're a fool. If you've had taxes withheld, you've probably overpaid, and you'll miss out on your refund; if you haven't, then you probably owe, and the IRS will come after you with a vengeance.
Contrary to some pseudo-populist bullstuff websites, income taxes are legal in the United States; this has been upheld by the Supreme Court, and is thus the law of the land until such time as Congress passes new legislation. (Of course, most of those sites also refuse to recognize the legitimacy of the Supreme Court, Congress, and in some extreme cases the entire US Government...)
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.