Two parents working has negative externalities as well. Costs adjust to what families can bear. Double incomes means increased prices and reduced purchasing power for everyone.
My wife's career never started. Her degree was worthless so she was working as a barista before we had kids. She does some work on the side, but she was never going to generate the kind of income I do solely based on our respective career choices.
If I lose my job, we can live off savings for several years. If I am unable to find work, the economy has bigger problems that are independent of my wife working or not. If I die or become disabled, that's what insurance is for.
No one enjoys divorce. In some cases it is a necessary evil, but I don't think anyone would ever characterize it as pleasant.