If you have lethal babies and/or lethal rigid carriers flying around an airplane in a crash, I think you've got a severe enough crash that most of these arguments are picking bellybutton lint. I'd vastly prefer the FAA focus on the rulemaking around ensuring that I'm not in such a crash than worry about what happens if I'm in such a crash. The chances that I get into an accident which is severe enough that I get killed by a flying baby, but I would have otherwise survived, are exceptionally low.