As generally people don't just nod off flying a paraglider, a medical event is extremely likely even if it has not been officially determined.

They might however "nod off" in consequence of losing control during risk-taking activities and being subjected to high Gs.

Whether "medical event" was prior to or resulted from risk-taking adventure,

and hence culpability, will await forensics I imagine. If those are possible.

That determination aside however,

risk-taking that puts others at risk (e.g., flying over other people) is morally and in many jurisdictions legally prohibited for obvious reasons.

I don't think that's true. I see powered paragliders out at the beach all the time, and to my knowledge that was perfectly legal as long as you are licensed properly.

I suspect that the story here is that until things went wrong nobody expected that this was a risk-taking activity in the first place (any more so than paragliding in general is). Do we have reason to believe he was doing it unsafely before disaster struck and he lost control?

Do you mean activities like driving a car?