You mean like when Garrosh nuked Theramore? The world will be fine. Nordrassil, the real World Tree, still stands. Teldrassil was created in arrogance to try to recover the NEs' immortality. The more radical NEs and druids have wanted it burnt since Vanilla. We're doing the world a favor.
If you can't handle real war, go be an Alliance and run through the meadows with the furries.