Remember that existence precedes essence. Therefore, it follows inescapably, as the night follows the day - that the cupcake cannon EXISTS in order for you to question why it exists. Further, that someone then decided the best thing to do is shoot a series of people in the face with it in super-slow-motion and went ahead and did that. This sequence of events had to happen before you could question why it happened.
In short. This is really happening. It actually exists. Now you can wonder if it's awesome, awful, or why, why why? But it exists. Its essence may be debated. Its existence may not.
You are losing your mind right now. You are welcome.