There's probably a million ways to justify the fight of a legitimately defensive war... and definitionally that would put many people in group 2, though I think many of those would feel more at home in group 1. This is even if it means you enemy's children end up cowering in fear, or any other terrible inhumane outcome.

That said, with reference to specific wars in recent decades, if you have to travel halfway around the world to fight... Then it's not a defensive war.