"The price of freedom?"  You keep using that word, I do not think it means what you think it means.
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The opinion column you supplied was written by Leftist Charles P. Pierce, whose hatred for Conservatives and the Bill of Rights comes shining through when he states, "You could be sitting down, watching the football game, and someone could show up, exercise their Second Amendment freedoms, and you’re dead before the final whistle blows."
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This shows an insane amount of ignorance for both the Constitution and, frankly, football.