Hoov,
Roll bars in street cars are pretty questionable.Roll bars with no padding are always wrong.Roll bars are ment to be used in conjunction with helmets.Just because this car has no halo with its diagonal brace,doesn't mean there aren't bars in close enough proximity to contact the occupant's soft heads.These cars flex.That bottom mounted seat will surely flex.Harnesses stretch.The human body stretches.The hoop and diagonal brace are absolutely within range of the driver's and passenger's heads during even a relatively mild impact.
I just want people to be aware of these real dangers,and act to protect themselves.If someone makes an educated choice to ignore safe practices,that's their perogative.The world can always use organ donors.