I recently heard a great quote on NPR that I think pretty much sums up the whole SOPA contraversy, which said something to the effect of this: "If, a few years after the invention of the automobile, it's discovered that bank robbers are using them for speedy getaways, the answer is not to regulate and ban automobiles."
I certainly understand the entertainment industry's frustration. The Internet doesn't divide along international boundaries very clearly in some respects, and it's all too easy for foreign sites to pirate American intellectual property. But, first of all, it isn't the right of the United States to intervene unilaterally on behalf of a global system. And second of all, the Internet is first and foremost a tool of free expression, and while that doesn't excuse those who use it for illegal activity, we can't curtail it for the simple purpose of stopping pirates.
I believe there are methods for combating piracy that don't have to restrict the Internet. First and foremost, we should try diplomatic solutions, forging agreements with countries where piracy is endemic and working together with their governments to hunt major pirate operations.