@roscoeraccoon Changing others' mind may be the hardest thing in this world. I understand your husband's concern that's a way of showing love to your cat. Try to talk to him, obviously you will not push him if he sticks to his rule. Good luck.
I think the problem of overpopulation of cats lies in human, not cats or other animals. There are many homeless kids, so should human stop making babies until every kid has a home?