Exchange the goblin for a foreigner who does not know your language or has a different culture.
Monster is just an excuse for human supremacy. We don't even know if this goblin needs human women to reproduce. MC understood that a killer life is not for him.
I believe he will try to come to terms with other races in the future.
*I will exclude the dead here because it is a philosophical question whether an undead can be good or not.*
man, i thought he was gonna befriend the goblin or something
since it had a hat and clothes, i thought it would have approached them for help for something and they'd become friends in the end
i guess that's not the case