Why would God create intelligent, curious, independent-minded humans knowing they would spoil His existence?
To be honest, you’d either have to remove omniscience or omnipotence for his logic to work with this question. Either God would have to be omniscient but know that no matter what he does each route will still mean that humans will ‘spoil existence’ – in which case, omnipotence is removed. Or, God has omnipotence but doesn’t do anything about the ‘spoilt existence’ because he is not sure of the consequences for his human children because he loves his children and he doesn’t want to see them in pain caused by himself – in which case, omniscience is removed. Or you could simply keep both omnipotence and omniscience and either say that God is a masochist because he loves us and lets us hurt him, or Gos is a sadist because people love him and he lets them hurt themselves.