Nothing in life is secure, especially not your job or financial situation. No matter how many plans you make, and no matter how much money you have in the bank, something could happen to bring a financially difficult circumstance.
Divorce is done; Custody is awarded; but the other side keeps on bad-mouthing you. Yes, it happens! Your divorce case is completed, or custody orders are in place, but the other side keeps telling your relatives, your friends, even your employer and anyone else who will listen what a totally terrible person you are, how you cheated in gaining what you were awarded, and whatever other terrible things the other person can create to tear you down. And often, the children are included in those tirades.