"There is no moral discussion to be had. There is an elemental plane of fire, water, air, and earth, and in the same measure, you can see the map, there is a plane of Good and of Evil, and being there causes you atmospheric effects just like the others. Good and Evil are elements. Some humanoids have minimal fire and lots of water in them. Drow have some Evil in them. Do not campaign for a fire elemental to be more watery."