Actually, this post proves my point. These were plane CRASHES, not just turbulence. The CRASHES killed the kids. Not the turbulence.
You left out a fact: There's a one in 8 million chance of being injured by turbulence on an airplane.
Not enough to worry about, in my book. And completely different from the stats regarding traveling in a car.
I am a flight attendant, if chances are 1 in 8 million I have been flying too long

. I have been injured in turbulence 3 times in my 14 years of flying. Thank goodness it did not warrant my needing medical attention. A flight I did not work, but my good friend did, hit bad turbulence which sent many to the hospital. The safety investigator got on and had tears in his eyes from all the blood on the ceiling of the airplane. They hit while the seatbelt sign was off, and many people were unrestrained at the time.
My husband and I flew ONE time, home from Philly to Chicago, and had to hold DD on our laps, and check her carseat. We got the last 2 seats on the airplane or had to stay another day. There was a snowstorm coming so we could've been stranded for days. I was a nervous wreck the whole time, but with no other flight available and I knew the flights the next day were pretty full, and if the snow hit (which it did) we both would have missed work for a few days. (We travel on free passes, and you have to take what you get, and the ticket agents used to try to NOT give my kids seats when they were under 2 and I insisted, sorry to those that got left at the gate...)
During turbulence we secure the carts, the galleys, the coffee pots....so why not that which is most precious to us? Our babies! I'd love to see it go into effect that ALL passengers must have a seat.
My girls are 5 and 8, they both still use big kid boosters with backs (my 8 yr. old just hit 40 pounds a few months ago, she is tiny) So this year when we fly we also have a baby boy and will lug 3 carseats. Although the ones for the girls are not permitted on the airplane as they don't have 5 pt. harnesses and use the car seatbelt so they get checked. And I am off work on a voluntary layoff so I will be paying full price for all 5 of us to go as I have no flight benefits right now. We want to go to Hawaii but thanks to the free flights all these years the girls want another trip to Disney and we've gone every year since the 8 yr old was 2.
I agree the risk of being injured is low. But I have been in turbulence where it is hard to hold onto something and that was bad. I would hate to see worse turbulence. I also feel my kids understood they had to sit in their carseats better than sitting in the aircraft seat, and it made them easier to deal with.