Uh, because it is a crime. I don't care how you try to rationalize it, you are not entitled to free entertainment. Period. You have two options: consume the product through legal publisher-authorized channels, or do without.
While modern IP law is in desperate need of reform (e.g., reduced copyright terms, better fair use provisions, application of first-sale rights and the "sold, not licensed" principle to digital copies, clamping down on patent trolls), I still believe in copyright in principle. Hell, in the U.S. it's even provided for in the Constitution. In Article I, Section 8, one of the enumerated powers of Congress is "To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries." In other words, copyrights and patents.
Authors, artists, musicians, and inventors have a right to get paid when someone consumes their works, and they should be granted exclusive rights for a limited time over production and distribution of copies. For some people, this is their entire livelihood. And for large-scale productions like big Hollywood movies or AAA video games, the publishers are investing many millions of dollars into those productions, with hundreds of people working for many months, so you're damn straight they have the right to sell their works for a profit without some schmuck going on bit torrent and getting it for free because he's too fucking sorry to pay the asking price.
Can't afford or don't want to pay for movie tickets or a Blu-ray? Wait until it comes on Netflix or TV. Can't afford or don't want to pay $60 for a game? Wait until it goes down in price, or buy used, or rent, or borrow from a friend. But bootlegging something is really just the digital equivalent of sneaking into a movie theater. If someone gets prosecuted for illegally downloading or uploading someone else's copyrighted content, well, too damn bad. They should have thought about that before they decided to break the law. Even if you don't agree with a law, you are still obliged to follow it, and if you choose not to follow it you shouldn't whine about it when Johnny Law shows up with a warrant. Everyone who's been busted for piracy deserved to have the book thrown at them, and I feel absolutely zero sympathy for them.