The right to innocence until proven given guilty is quite fundamental to our legal system, and laws like SOPA and Protect IP go against that very ideal. Right now these laws that take away these fundamental freedoms are only in the copyright domain, but if these laws stand, I'm assuming they could be used as a precedent and used to justify other laws that take away the presumption of innocence. I'm not a lawyer, but this is what these laws seem to be heading towards.