You know, back in season 1, Locke was trying to help Charlie to quit using. He did so by claiming he could help the moth by cutting up its pupa, but that would make the insect weak. So he decided to leave it alone, let it come out of the pupa on its own, thus making the moth stronger, and giving it better chances at survival.
To me it seems like it is exactly what Jacob is trying to accomplish. He doesn't want to step in, he wants his moths (like the survivors) to help themselves and be stronger.