In D&D I absolutely hate Lawful Good characters because they are REALLY inflexable. It makes it a drag, cannot steal or do anything to forward your cause without some snarky whiney lecture. The "evil" route would be to kill EVERYTHING and nick all their shit. You would have figured a way to kill the Druids and Tieflings probably by setting up BOTH sides for heavy losses then killing the leftovers. Evil characters are out for themselves, tadpole or no. The second an "evil" character figured out they cannot get help off either party the gloves would have come off OR they would just move on if they couldn't be arsed.
There is no "evil route". If you pick "the path of least resistance" that makes you smart/lazy not evil.