The evidence is that it makes a small risk of injury and death even smaller, so you're right that current car seats aren't unsafe. They are less safe. Mind you, we take a lot of safety precautions against very small risks all the time e.g. cot death.
There is another, bigger point about ff vs rf here and that is that parents often turn their children around before they 'need' to i.e. before due to height and weight restrictions the seat stops being suitable.
From the AAP release:
?A rear-facing child safety seat does a better job of supporting the head, neck and spine of infants and toddlers in a crash, because it distributes the force of the collision over the entire body,? Dr. Durbin said. ?For larger children, a forward-facing seat with a harness is safer than a booster, and a belt-positioning booster seat provides better protection than a seat belt alone until the seat belt fits correctly.?
So what I'm getting from that is the longer children are kept in seats that better support their bodies, the better the protection. For the very youngest children, the safest way is backwards. I think that's because their heads are disproportionately large compared to their neck strength and the rest of their body.
"While the rate of deaths in motor vehicle crashes in children under age 16 has decreased substantially ? dropping 45 percent between 1997 and 2009 ? it is still the leading cause of death for children ages 4 and older. Counting children and teens up to age 21, there are more than 5,000 deaths each year. Fatalities are just the tip of the iceberg; for every fatality, roughly 18 children are hospitalized and more than 400 are injured seriously enough to require medical treatment."
"New research has found children are safer in rear-facing car seats. A 2007 study in the journal Injury Prevention showed that children under age 2 are 75 percent less likely to die or be severely injured in a crash if they are riding rear-facing."
Car accidents are really really rare and I hope this doesn't come across as scaremongering as it's definitely not. After all I think it's probably a balance of lots of factors that would make someone decide one way or the other about the seat i.e. the likelihood of injury in a car is really low anyhow, it costs a lot to get a seat, most of us don't actually drive our children significant distances in the car anyhow ...
BUT
given that the seats ARE definitely safer in the event of the average crash bad enough to injure a child, and that I had to save perhaps an extra £100 to get one over the forward facing model I was otherwise going to buy, for me personally it was the right decision. Fully accept it's not the right decision for everyone.