Would I be a bad person if I let my moms cat outside?

My mom got a kitten a little over a month ago. She keeps saying that when she is grown, and spayed, she's going to let the cat free roam outdoors like her last cat. I gave her all the reasons as to why that's bad idea, but she doesn't care. I don't think its illegal or anything, so I don't know if there's anything I could do, so I might have to let her do it. Would that make me a bad person?

Would I be a bad person if I let my moms cat outside?
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