While some people don't jailbreak for the wrong reasons, the vast majority of people do. People do it usually to play pirated content. Pirating is wrong.

@above. pirating is already against the law, thus using it to do that is breaking the law. Why make doing it period against the law?

There is nothing wrong with altering something you buy. After all a majority of Apple's products are just tampered products someone else made anyways.

@Soldierone - Actually you are wrong to an extent. Yes pirating is against the law but jailbreaking was illegal initially, BUT an exception was made in the DMCA allowing users to jailbreak or root their phones. However the basis is that once you buy the phone, you are buying a lifetime license to use the OS, just like how you would pay a license fee for Windows or Mac iOS. It's still their software and they can dictate how it is used. The main reason being so that users don't hack paid apps. With the exception in place, Apple now voids any phones they find running jailbroken software. If by any chance your phone bricks with Jailbroken software, Apple will not fix it on the grounds that you voided your contract. The minority of users may want to modify their interface, or how a few things work. I think their should be some kind of wingle room to allow for visual or performance edits, but not to bypass paying for apps.