A quick look at REI.com shows that both carabiners and climbing ropes are rated to about 7 to 8 kilonewtons (1573 to 1798 lbs) of strength. However, if one of the ‘biners was abused and the gate wasn’t quite right, could that have contributed to a failure? A carabiner failure in that case would be the fault of the climber for not checking his gear.

But then I’m not a climber, my carabiners are for attaching things, not climbing. For my uses a carabiner is a simple over-built convenience.