SO surprised that there is already a lawyer involved, trying to blame the cruise line.
Picking up the baby "so she could bang on the glass" just makes it even worse. Why encourage/indulge that kind of behavior? Ugh. It's never a good idea to let kids bang on windows, regardless of what they are made of. I bet it annoys the people at the hockey rink too...
I also cannot fathom NOT noticing that there isn't a windowpane. I have accidentally walked INTO a glass door because it was so clean I didn't see it, and my son was 2 when he once face planted into a glass floor to ceiling window for the same reason, but can't imagine the opposite happening. This man must have had vision issues to not notice that the glass was missing.
I really hope the cruise line has video footage of this incident, considering all the conflicting stories coming out.