SOPA is one of the beginnings of Socialism/Marxism/Communism. One step closer to ending up as slaves to the government. Prime example is North Korea... The people are suppressed heavily and have a super government firewall like china.. BUT Nothing gets out much. China has SOPA times 10.
Here in America we really have freedom going well for the last ~250 years, lets not burn what the constitution was built for. The fore fathers may have not known what a nuclear bomb was, but they did know what the end of freedom can look like, what government oppression looks like, and what a true free market looks like.