Having your phone and recording it, whether still, photo, video, whatever, is a complement to the event. If you look at the drop in crime in many cities across the world over the past, really, 30 years. I am all in favor of speed cameras, red light cameras, iw cameras on every street, corner, film everything. It's not understanding the different dimensions on which people gain happiness or utility.
Also: how do phone cameras affect the way we experience live events?