OK...Devils Advocate here... so.... here is the airline being castigated because the FA involved apparently made an infant travel in a way that was "not safe"
Yet whenever "lap children" are discussed here we see a LOT of defence of the practice....because (I assume) the chance of ANYTHING happening is so very slim....even though I doubt ANYONE would actually suggest a child on a lap IS in any way "safe".
Conclusion? Airlines can't do anything suboptimal for child safety.... Parents CAN. Sound about right?