Forget about this.
Burying your head in the sand is about the saddest reaction I've seen so far. What's the point of discussing the causes of an accident, if at the end you arrive at "won't happen to me, don't think about it, la la la" denial? Sometimes it seems that's almost the goal - to find a reason to dismiss an accident as "couldn't happen to me!"
There are several worthwhile take-home messages from this thread:
Belay loops rarely fail, but do require a second glance every now and then.
Most cavers will hold backups above the device open, but it is an unresolved issue for backups below the device and for whether this depends on users' experience level with the backup.
Backups clipped to a leg loop may rip that loop apart (I suspect this depends on the type of leg loop - buckle vs. stitched, one-piece vs. independent loops).
Girth hitches can break Dyneema. Girth hitched daisies can fix your belay loop in place, possibly causing accelerated wear in a less noticable place.
Replace slings when they need it. Soft goods wear out, period end.
Just because the accident investigation didn't arrive at "abandon your belay loops!" doesn't translate into "forget aobut it" for me.