30 years ago, when I was a child, my father was in the US Army. Because of that, we relocated all over the country every two years or so. We did NOT have the choice of whether or not to bring my baby brother onto the plane we couldn't even afford ourselves because the move was paid for by the Army. They say jump, you say "how high?".
You don't know every situation. And after 41 years of life, I don't pretend to know what someone else's situation is either. So I generally let dumb shit like this slide now. It's not important enough to get worked up over.
That's not how reassignments work if you have a family. You don't travel with a pack of grunts. You do it as a family on a civilian airline like everyone else.
Because while a baby on a plane might be annoying to other passengers, they're getting the worst of it and the contempt from others on top of that. Must be fun