If there is one bar going from B pillar to B pillar and its essentially right up against the back of the seat, and the rear passengers are in 4 point belts, there is no way anything critical (like you face/head) is going to hit that bar.
Yes, in the event of a huge rollover etc, arms or legs could come into contact with it, but they may also hit the roof, window, seat and a million other places too that could do just as much damage. I think the risk is pretty small.
Now if there are big down bars, main hoop and a halo..... thats where "head vs bar" starts to come into play......
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