OK, why does the public think they have a right to tell someone not to do these things?
When I was 3, a family friend designed the first tandem parasailing harness, which is now comercially available. I was strapped into the harness, then clipped to the adult rider under a parachute! People said the same thing about this. How could you? What an idiot, ect, until they realised it was just as safe as any oother watersport, then they started selling it. It is the parents right to do what they want, and I for one am hellishly gratefull to have been the test pilot. I could swim, as should any kid near water.
Maybe we should ban waterskiing to (risk of impact injuries, drownings) ? How about kids learning to sail (god, not only impact injuries, but rope tangles after capsizing, how did i survive) ? Swimming at the beach (spinal injuries, rips, etc)?
The world is full of wowsers and do gooders. If you think its dangerous, then dont do it. He's not making you do it, just showing people that might have been trying to work out there own way to do exactly this, which it sounds like others have tried.
PS, just a bit of info, it takes around 2 seconds to release one of those harnesses. Was a simple clip release on the one I owned