The same concept could be applied to the situation with the Grove. Which is best? Is it best for me and my companions to die trying to fight these goblins and their leaders in the heart of their den just the four of us? What will happen if we die? Will they not then eventually raid the Grove and kill everyone in it? However, if I lure said leader and a bunch of her goblins too The Grove and help them defend it, now I have more defenders and a better defendable position and we might all survive.
Well, it is you who gives Minthara location of the grove, endangering everyone in it, and slaughter a big chunk of local Goblin population, and possible cause few tiefling deaths in the process. I mean, the whole ordeal is that goblins might find the grove, and you go and tell them where it is.
If Goblin extermination is your goal, then that probably is the most efficient way (though personally I find grove defence far harder the killing entire goblin village by myself - not to mention you can take Helsin with you, who is trained in combat, offers to fight goblins and will make the entire encounter rather easy).
If I were to rate it, I would see it as pragmatic solution - neutral? You are willing to help, but not endanger yourself more the necessary for the sake of others. It is a path that leads to a lot of bloodshed that could be avoided, if one would just remove just the leaders and perhaps their immediate guards. And even if you deep goblins as evil that needs to be remove, going it with Helsin doesn’t put civilians in danger.
