My friend called me selfish for not wanting to have kids?

I think that wanting to have kids or not is a personal choice, so I'd never judge someone for it. Yet my friend thought it was okay to call me selfish for not wanting to have kids. I'd rather adopt a kid who needs parents than create one and put him in this terrible world. I don't see how this is selfish. Why do people think it's okay to judge others about this topic?
My friend called me selfish for not wanting to have kids?
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