YOU SAID:

if a it what's the who, why does the it at the to?

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もしそれが誰であれば、それはなぜ、それを誰がするのでしょうか？

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If anyone else, why does it do it?

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他の人なら、それはなぜそれをしますか？

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If others, why does it do that?

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もし他の人がいれば、それはなぜですか？

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If there are other people, why is that?

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他の人がいるなら、それはなぜですか？

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If there are other people, why?

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他の人がいる場合、なぜですか？

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If there are other people, why?