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Answering your question of, Is it practical to shut down offending websites...my answer is yes, especially if it is offensive, or has been associated with criminal activity. However, we walk a fine line between overall power to do so, and keeping the Internet safe. Even with SOPA, or variant of, is passed, hackers and spammers will still find a way to manipulate the Internet for profit and there will always be an audience.
I really doubt it. There are many, many websites out there that exist on the fringe on the "dark web" or "deep web". Much of the web, perhaps even most of it, is made up of data and web pages that are hidden from search engines. Without hyperlinks to be indexed by search engines, these site are essentially invisible, generally with the DNS passed on from individual to individual. Many of these are benign sites, or simply abandoned and inactive pages. However, there are also sites that exist for illegal purposes. The person who came up with the term "deep web", Michael Bergman, published a paper in 2001 that estimated the deep web was 400 to 550 times larger than the searchable web. That's a lot of non-indexed data. As a practical matter, existence on the dark web means it is gone to the average user, but it does still exists and can be found by determined users. And if the host is in Ukraine, Russia or the like, it is unlikely that anything can be done.
I agree with Jim Lynch... " never underestimate the power of the US government to go after people"
The US Attorneys' General threatened Andrew Fastow's wife with 10-years prison because she also signed their joint tax return if she didn't testify against her husband.
Her reward? The DoJ allowed her to serve a two-year prision term PRIOR to her husband's TEN year term so that she could watch their newborn baby instaed of giving him up to foster parents.
The US government plays for keeps.