My mom's stock answer to the question why? was, because I said so and I'm the mother and that's good enough.
She was also fond of, life's not fair, get used to it. I'm a better mom than she was and my daughter is a better kid than I was so these god awful expressions aren't used in my house.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226