@Rimuru sama If he kills a human, the diplomacy he has been building could be destroyed. From the humans’ perspective, if the goblin kills a human, it would be seen as a clear sign that he has broken the diplomatic relationship he has been carefully establishing, and that could potentially trigger a war.
That is why he deliberately chooses not to kill humans. His actions are calculated to benefit the goblins in the long run. It is similar to what happened with the bet he made with the Count. When he realized that he had lost, he did not simply react emotionally or accept the situation as a defeat. Instead, he guided the situation in a way that ultimately created an outcome that benefited him and the goblins. His actions show that he is constantly thinking several steps ahead, using diplomacy and seemingly unfavorable situations to achieve his larger goals.