Sometimes kids have to fly and they can't be expected to act like adults. I was on a flight to Europe with a baby who cried the entire trip. The mother seemed, for lack of a better word, ashamed by it. I was across the isle from her, when we made eye contact I always smiled to reassure her I sympathized with her. Some people gave her dirty looks but I felt kids crying is something parents can't always prevent so why make them feel worse? I don't have the same sympathy for parents who let kids listen to movies or music without headphones. Why people think they are entitled to a quiet child-less flight is amazing to me. You are on public transport. It's a flying bus. It's families traveling for work, adoptions, military, and yes vacation. People should expect noise and have noise-cancelling headphones if it bothers them.