Law enforcement has been going apeshit about legally forcing Apple to build in hardware backdoors to their products. If this jailbreak didn't exist, they'd be putting a gun to Apple's head and demanding decryption tools for all iPhones.

Furthermore, the entire point of a jailbreak is to regain root access to your own device - Apple provides no way for a user to do so, which I find at least somewhat irksome. The way it currently stands, all iOS devices ship with Apple having total control over the device, and a jailbreak lets you claw back control by force if you so choose.