To land a square canopy requires training and developement of a skill set. Get it wrong and you die and is the major cause of fatalities in the skydiving community.
Fair comment, because fatalities have definately changed from equipment failure ro aggressive hook turns at low level under a viable canopy, but:
- showing off plays a large part in that shift in emphasis and
- seeing as they're already aviators, the skill set is mostly there to begin with