Why did netero still chose to fight?

Okay I am still watching the series, and please don't give out any spoilers

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I was wondering about this one scene from hunter hunter

In the chimera ant arc

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When netero first faces with chimera ant king, chimera ant king wanted to talk with netero,

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He mentions that he would be a just king and would never persecute the weak and would help them

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Although I am still watching the series so I might not have the full context here I am literally at this fight right now, but I wanted to understand

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Netero rejects talking stating that the 2 races can't coexist and no matter what the outcome would be the same

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What did he mean by that? What outcome would be the same? He did believe that the king could be swayed but he still went ahead with the fight

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Why?

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