One of the ideas in copyright in most countries other than the United States is referred to as the moral rights of the creator or author. Moral rights include the right to maintain the integrity of the work. This aspect of moral rights has not been implemented in US copyright law.
Clearplay has brought to market technologies that trample on the integrity of movies in the interest of shielding children and adults from sex, violence, and other content some find objectionable. Congress legitimated Clearplay-like technologies when they passed legislation outlawing recording movies in theaters.
Let's be clear: people do and should have the right to watch or not watch content they find objectionable for any reason. Parents do and should have the right to determine the viewing content of their minor children. Period.
At the same time, authors, directors, artists, and copyright holders should have the equally important right to maintain the integrity of their work. Artists and directors are asserting that edited versions of Malcom X, Hang 'em High, Get Shorty, or Starship Troopers are not the same works intended by their respective directors, producers, and actors. They have a point.
There is an economic issue here as well. Copyright law reserves to the rightsholder the privilege of creating derivative works, that is, works based on and incorporating in some way another work (let's not deal with fair use here). Although it is undeniably true that the DVD is unaltered by the Clearplay technology, the viewing experience appears to be a derivative work however fleeting its existence. The rightsholder apparently receives no additional direct compensation for the the creation of the derivative work.