I'm not entirely sure you're not trolling, but I'll bite anyway.
The US Constitution states that the purpose of copyright is "to promote the progress of science and useful arts", artists and inventors may be granted a (temporary, limited) exclusive right to their work. Anytime copyright comes up among my group of friends (who include a large number of writers, musicians, and graphical artists, in addition to programmers) copyright is a fairly contentious issue. I tend to like to argue the position that any "common", mass produced work that is unavailable for public purchase for longer than one year has outlived its' salable value and should lose copyright protection. (This is particularly true in the age of digital distribution, where "shelf space" is a non-issue.) Fine art (where only one copy of the item ever gets created) clearly requires a different definition for copyright term, but for the things which usually are referenced in these debates online -- CDs, mass market books, newsclippings, etc. -- a strictly limited term is far more beneficial to keeping works available to the public.