It was a forgone conclusion that at some point the governments would want to police the internet.
At the start of the 20th century just after the 1st world war, governments started to loose control of information. This was due to communications devices becoming cheap to use and global travel becoming affordable. In order to police information they let advertising take hold in a big way.
The mechanics are simple, If you publish unembellished hard fact then you have a harder paper to read. Added to that advertisers can in effect boycott your paper. This reduces your publications availability, and is the ultimate downfall of free information.
The papers that got a boost from advertising published trash, or politically minded news with a bias, Favouring consumerism, and the new capitalism that we live in today.
Look at the TV industry, the "filler" is actually the content your watching. The "content" is the advertising. The more people want to watch your programs the more the channel gets to charge for the advertising. You put on a program about hard fact, your ratings drop to a smaller audience, You show mindless violence and the odd splash of a nice ass your ratings and advertising rates go up.
Now back to the SOPA debate.
The businesses that drive advertising, Forcefully in most cases, And the revenue that generates is been lost to a free internet. You think the government want to control content your only half right, They actually want to get an audience, something they can sell. And with that they bring business back on board.
The main drive is and always will be the money in your wallet. They don't want you to have it. Spend it you need these items. A free internet lets you see what's real, Cut the crap from advertising, and learn about things for free that you would otherwise have to pay to train up in. As a free internet user you are unmarketable, And with that you gain power.
Who wants to place a bet with me that if this does happen and you guys get an automated censor, that the page it links off to will have advertising, lots of it, High in value, and very very profitable.