But who ever said kids should be able to do whatever they want whenever they want? This feels a bit strawman to me. No one is advocating for that, certainly not me.

Kids are going to be on your public transit, your airplanes, on sidewalks, at pizza shops, etc. and people need to not just accept but embrace them. They are a part of your community, just like any other person. If being an inconvenience or annoying was an acceptable reason for people to reject you, then we’d have a lot bigger issues (than we already have) with the elderly, people with autism, people in wheel chairs, etc. No one gets mad when the bus takes an extra bit of time to help someone with a disability get settled. Yes an infant may cry or scream in public. They do that.