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you encourages safer driving - giving a positive benefit to road safety perhaps?
...it's not usually you you have to worry about, it's the nutters coming the other way.
The roads have got busier, yeah, I used to bounce around in the back of my Mum's mini too, but then traffic volumes and the capability of speed of vehicles has risen a hell of alot since then.
The advice and laws are made as time's change. I'm sure any parent would want the best for their kids and would do anything to ensure they're not seriously injured should the worst happen? I'm all for letting kids get on with it, climbing and playing etc. etc. but when that 44ton lorry pulls into the side of your car 'sorry mate, didn't see you' - you'd want the best protention possible?
I've seen pictures of the results of accidents without proper restriants. It's not pretty. If I have kids or I take my godson out, they'll be in proper restraints in my IIA, retro-fitting isn't that difficult.