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Well that's a terrible analogy.

Can you be a little more constructive than that? If you think it's terrible, maybe you can explain why you think it's terrible?

Can you explain what water is and what the glass is in your analogy?

Water is people, and glass is the planet earth, with its limited natural resources.

The Earth still exists and yet there are ~7 billion people on it. Is that too many?

Make a bigger glass...