but gliders are designed for getting out of
Hmmm, if I designed GA aircraft to get out of in flight, I'd have a great number of people asking me "why?". If I answered, "because, I think they might need to one day", I doubt the aircraft would get approved, until I made right the defect in the design! (I have not had occasion to work on aerobatic aircraft, which I acknowledge require this capability as a part of their design.
I have flown both gliders, and aerobatic aircraft, and only ever wore the 'chute while flying jumpers, because of regulation.
Staying with the airframe is certainly going to kill them.
Huh?
Yes, people get killed in planes, but lots survive crashes....