Okay, interesting point. I know that the most serious injuries in Jeep roll-overs are from people thrown out - or sometimes worse, thrown PART of the way out - because they weren't wearing a seatbelt. Next worse is putting your hand out to hang on to roll bar or having your arm flop out during a roll.
So if the rule isn't to hold onto the steering wheel in case of trouble (which I always thought it was) because it can collapse in on you, what are you supposed to do?
Redbird 3 years ago we had a guy lose a finger to that bar.
The women in the group had yelled at him at least a dozen times to get his hand off the halo bar, and when he did go over.... Had his hand on the bar, and the bar hit a tree...
Bar are tree were MUCH stronger than finger, so the tree/bar won.
Most of the stock YJ's & TJ's I've seen, I wouldn't trust that bar, it's VERY THIN STOCK,
Something is better than nothing!
It's also good for keeping trees from snagging on your 'Roll Bar' when on an off camber spot!
I got a tree wedged in between the windshield and roll bar last year and had to get out in the mud to get the windshield pulled off to back up enough to get out of the predicament!
Halo bar sure would have guided that tree past the roll bar and off the back!