Not true. Well, it's all grey territory anyway, but some is much less grey than others. CD-Rs and DVD-Rs are widely used for legitimate backup, so much so that it can not be truthfully claimed that their main purpose is copyright infringement. Like I said, BitTorrent is also used for legal purposes, I know that Linux distros are often made available with BT, and even Blizzard used it to release the WoW beta, so in that case the arguement could be made. But most 2nd generation P2P (Kazaa, Morpheus, Bearshare etc) are not particularly useful for distributing large files, as is the case with BitTorrent, so they are used mainly for music, apps and so forth.
Again, I'm not against filesharing. I do it all ther time, probably more than most. But I do acknowledge that a) it most cases, it is blatant theft and b) many, if not most, P2P programs are created expressely with copyright infringement in mind, and are used mainly for that purpose.
By the way, I am also against restrictive gun control, one of the rare cases where I think the American right has it right.