Where does this "statistic" come from? What is the basis of your accusation? Do your "facts" include the tens of millions of people that use bittorrent technology for legitimate uses? There are dozens of legal torrent sites, software/OS distros, and even World of Warcraft that use the technology legitimately, you know.
1. The decision on whether a piece of technology is legal is not based on its majority use, but on whether there are substantial non-infringing uses. (first Google result, didn't follow link: http://www.justice.gov/criminal/cybercrime/ipmanual/05ipma.h... "Indeed, it need merely be capable of substantial noninfringing uses.")
2. The vast majority of freeway traffic is in excess of the posted speed limit. You don't hear many arguments to shut down the freeways as a result. [Yes, I know proof by analogy is weak.]
How about HTTP traffic? BitTorrent is just a highly effective content distribution system like HTTP. But unlike HTTP, it scales even if the upstream bandwidth of the initial data server is limited. BitTorrent simply gets all the flak for this property.
Facebook uses BitTorrent internally to distribute new versions of their PHP-code to their server park of tens of thousands machines. Because the single server would be upstream-congested if it wanted to push out a change fast.
