If they are evil (but reasonable, and know how to speak and realize themselves ...), this gives us the right to kill their children, but children of good races cannot be killed? NSDAP said the same Goblins are people too, they have feelings, intelligence, and so on.
Take a look at what is roasting on the spit in that picture. They are EVIL! The only reason they aren't attacking my character is because they think I am a True Soul. Stop trying to make moral equivalency arguments. Goblins have no morals and they generally kill on sight.