FACT: Not everyone who uses Megaupload, Rapidshare and other filesharing websites are pirates. Some do use it for ACTUAL sharing of large files, between client and supplier.
FACT: SOPA is a blanket law. It is indiscriminate. So as long as a website is allegedly violating the Copyright law, it's a target.
FACT: Everyone who has used the internet has violated Copyright at least one time, knowingly or unknowingly.