Before all is said and done, I bet there will be a lawyer (or three) that will agree with you and go after anyone that took him there.. Waivers or not..
The lawyers are already lined up.
The instructional agency will throw the store and instructors under the bus.
The Insurance agency(s) will try to settle out of court.
Ambulance chasing lawyers will want to go to trial.
"Expert" witnesses will be hired on both sides.
The event was tragic.
The aftermath will drag on for some time.