Because it's a parody. Parody is protected by the First Amendment, qualifies as fair use and thus is not considered an infringement of copyright.
The Supreme Court decided this in Campbell v. Acuff-Rose Music, Inc. (1994). And it's pretty much stuck to precedent. The most recent parody related lawsuit I remember is when Mattel sued the band Aqua for copyright infringement for the song Barbie Girl. The case was dismissed.

Black's Law Dictionary definition of parody:

"A transformative use of a well-known work for purposes of satirizing, ridiculing, critiquing, or commenting on the original work, as opposed to merely alluding to the original to draw attention to the later work. • In constitutional law, a parody is protected as free speech. In copyright law, a work must meet the definition of a parody and be a fair use of the copyrighted material, or else it may constitute infringement.
"Trademark parodies, even when offensive, do convey a message. The message may be simply that business and product images need not always be taken too seriously; a trademark parody reminds us that we are free to laugh at the images and associations linked with the mark." L.L. Bean, Inc. v. Drake Publishers, Inc., 811 F.2d 26, 34 (1st Cir. 1987) (per Bownes, J.).
"We do not, of course, suggest that a parody may not harm the market at all, but when a parody, like a scathing theater review, kills demand for the original, it does not produce a harm cognizable under the Copyright Act. Because 'parody may quite legitimately aim at garroting the original, destroying it commercially as well as artistically,' the role of the courts is to distinguish between 'biting criticism that merely suppresses demand and copyright infringement, which usurps it.' " Campbell v. Acuff-Rose Music, Inc., 510 U.S. 569, 591, 114 S.Ct. 1164, 1178 (1994) (Souter, J.) (citations omitted).
Source(s):
http://www.publaw.com/parody.html
http://en.wikipedia.org/wiki/Barbie_Girl#Mattel.27s_lawsuit
http://en.wikipedia.org/wiki/Fair_use#Fair_use_and_parody
Black's Law Dictionary

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