From the look of the not-just-a-little-disturbing video, the fault seems to echo Evel Knievel's Snake River Canyon steam-powered-rocket fiasco; parachute launched way too early.
Not that the risks weren't abundantly apparent, and not that there wasn't an idiotic level of irresponsibility (and a lot of crazy) in all this, but still; sad deal for him and his family. Maybe worse, the deceased and the family probably signed giant stacks of contracts that contain the magic phrase, "indemnify and hold harmless" and "assigns and heirs" so they may very well be out of luck financially. (Cheap legal tip; if you see those phrases in a contract, you need a lawyer. You're saying that if something goes wrong, not only will you not sue the bastards, you'll cover THEIR losses - and the same applies to your estate and heirs.)