Guy walks in a dive shop, wants to share his love of the water with his grandkids, as so many of us did when we "learned" to dive. Dive shop employee (following the rules of the shop, agency, and insurance company) tells gramps that he will kill his kids, and they won't sell him a reg, won't fix his old one, and won't rent him a tank. BOOM!! Gramps walks out all PO'd and goes out and buys a $45,000 bass boat. We've lost a certified diver forever, and 3 potentials because of our modern attitude to scuba.
An alternative might be to fix grandads reg (if possible), or sell him a new one. While doing this, tell gramps that he can have 10% off snorkel gear if he brings the kids in for snorkeling lessons. CHA-CHING!! We've sold a grand worth of gear, made gramps a loyal customer for life, and gotten the kids in the water in a manner that satisfies our love of liability and agency requirements.
I don't think Tammy and the other kids at the dive shop did anything wrong. They acted exactly as our training agencies, insurance companies, and in accordance with what every instructor since 1995 has been taught. I just think that there might be an alternative that doesn't have folks throwing away their scuba equipment in disgust.
So you would advocate putting a child as young as 5 yr old on scuba? I totally get the part of wanting to share the experience,.... but why not hire an instructor for a short time to do it for the kids when they are old enough? Is saving $25, $50, $100 & waiting a couple/ few years, worth a child's life? As for the liability part, how much paperwork does your live aboard customers have to fill out? Why? What kinds of rules does your business put on the divers controlling aspects of their dives? Why? Do you let someone with sidemounted doubles do technical level dives, even though they have no proof that they are at that level (certification)? But, hey, they are "experienced". Let's face it, it is a litigious society we live in. If we had repaired the regulator (which we could not) & rented the tank to him knowing what he planned to do with it & say the 5 yr old freaked out, panicked & bolted to the surface hold their breath, experienced a lung expansion injury,.... wound up in the hospital or worse,.... Who do you think the lawyers hired by the parents will go after? You know the answer well, as a business owner- the deepest pockets involved they can find.