I can only imagine the pain inflicted upon the very young while suffering one of the hundreds of colds they have to go through. I for one have been totally disabled with sinus pain, and I did everything I could to fiddle the cabin ALT, and change cruise levels. It was horrific. Totally gone by <10,000'
But this is not what I feel most strongly about.
So few people it seems, have any idea about inertia. On a mother's lap FFS! In a perfectly survivable crash there could be forces that would mean the average person couldn't even contain the accelerative forces on their arms, let alone the most precious thing they'll ever carry. Putting them under the belt, would of course be potentially disastrous.
It's not allowed in cars, how the heck did it ever become legal in aircraft.