You're assuming that trained pilots somehow had no idea what they could safely do in their aircraft. Why?
GGP made an assumption and then reacted to that assumption as though it was a fact. We weren't doing loopings or Immelmans, just a couple of nice steep banks and a pretty steep ascent/descent. If the plane would have not been able to handle that it shouldn't have been flying in the first place. I've been through lots worse in single engine GA planes in rural Canada.
Not legally, morally.
I tend to think so, given that creating a thrill-ride is outside the scope and purview of being a private pilot.
A professional, acting outside the scope of his profession, who seems to be acting with malice or disregard creates a situation that could quite literally kill a person who has certain conditions (even unknowingly).
>Noone's life was at risk.
I can't do the mental acrobatics that are necessary to see that as a zero risk situation.
It's not just the airframe that the pilot is tasked with worrying about, the safety of the occupants comes first.