Falls by the Unprofessional to be expected
Been seeing or hearing the reports of tree stand falls for decades. Many do their swan dives without ANY tethering safety equipment. Nothing; nada.
Some are unfamiliar with their equipment, some never check their equipment, some never practice with a climber, some even drink alcohol, some are downright careless. Some are unhealthy and some are very much out of shape.
Each must judge how capable they are climbing a tree and hunting. Everybody isn't made equal.