Well then you're obviously a great person to talk about it.
You can't blame 4chan as a website for posting any type of CP, and you can't "shut it down" because of a few bad apples. It's completely user generated. They have a report system in place and most users report threads that may contain any type of illegal content. Mods get rid of it quickly and the people that post it are banned, and I'd wager a guess that a lot of the offenders are reported to the FBI. If the content is coming from a United States ISP then that shit is gonna be looked into obviously.
This thread will turn into a blind bashing of 4chan from people that "have only visited a few times", and I mean I'm okay with that. Whatever. I like it. I visit /sp/, /fit/ and /v/ almost daily. It's very humorous.
The fact that CP is posted there should really be enough to form an opinion on the site.
They say the government has no rights but just look at the internet in 2012. Sites are shut down left and right and all kinds of material is taken down.
This is the time in net history that these offenders(especially people who post child porn) are in some serious trouble. Many countries are taking legal action against it and yes I do believe they can take down 4chan without a sweat. Besides it's not like that side has a good rep or anything.
I would not be surprised. I would not be an arrogant one if I was one of those people. Good days are indeed over. Government is really serious of putting the massage out that you are not allowed to do what you want.
Although porn in general has the biggest base on the net. Tracking down all sites who might have child porn mixed up with other porn is a humongous task. I wonder if they ever succeed but sure as hell they have started pushing back.
And hell I would sense that this is only a beginning of this cyber war that has started....
Another interesting note is that people think that those agencies still care what anybody thinks. By now they should know that they don't and they can do whatever they please...