I don't think picking someone up from an airport is being their mother. It's kindness and helpful, I've done it plenty of time for others and vice vers
You are totally missing the point. It's not about volunteering to do it willingly. If you want to use your time in that way do that, that's your choice.
It's about the expectation of a man that his wife will pick him up - in this case at midnight.
If you are an adult, your starting point should be that you are responsible for your own trips and travel and you get yourself home. Unless you really need help (injury for example), it's just selfish to expect other people to pick you up from an airport (them travelling there, waiting and back vs you travelling just back).
A man expecting his wife to pick him up is exactly as I said - like a baby wanting his mommy to sort out his travel for him.
A decent man would realise that expecting someone to inconvenience themselves in the middle of the night to hang around a likely desserted airport/walk from carpark/wait in the car park whatever it involves will likely be lonely, cold, miserable, probably depressing, possibly unnerving or frightening depending on your mindset or lighting. To ask this of a woman who - like it or not realistically is more vulnerable to physical attact in a car park alone at night - is very selfish. Worse if it's your wife who you are supposed to love. This isn't rocket science. It's not a two person job. We can all pay to get a cab even if it is more than you'd like to spend.