Thank you for the voice of sanity. I think a lot of the comments about filtering == bad come from small to medium size businesses.
Move to enterprise scale, financials, anything subject to regulatory oversight, etc. and it's a totally different ballgame. Lots of comments about trusting users to Do The Right Thing. Guess what though...many don't realize what's Wrong and Right here...or it's far too easy to justify Wrong. Ignoring my personal opinions, pirating music is still illegal is the US...but plenty of people wouldn't think twice about loading a torrent client because they "have to" play this particular tune for the boss that's so perfect for etc. etc. etc.
I can't tell you how many "work" computers I've dealt with in the past that are loaded with personal information, pictures, pirated software/music/movies, porn, etc.
NBD in a small office...but potentially a huge legal issue for Big Business LLC.