This is a fight between content creators who make content by their hard work and few web companies who make money on others content.
SOPA is claiming that they are protecting theft of U.S. property, promoting creativity, entrepreneurship, innovation etc. it is clearly supporting content creators. Web companies are claiming that they are protecting freedom of speech, privacy, etc. Is it so? Web companies are trying to hide behind end users. Almost every country (will be) facing this problem.
How many people are going to suffer by implementing this new rule? Probably many people will suffer (users, web companies etc), few people make some more money (content creators).
Since other countries may follow US, It makes sense to stop SOPA or at least need for amendment on SOPA to make it soft rules for end users.