I agree that the nature of the universe is in the cycle of change. However, I see no rationale here for participating in destruction beyond the necessary minimum.
You go to war to stop an evil, confused or cruel tyrant, group or government from hurting those who need protection. You destroy or change the environment to improve the circumstances of those who actually need the improvement.
To do these acts for lesser reasons is unnecessary. Killing an ancient forest to save money on paper, leveling jungle so a land baron can profit on selling gourmet coffee while his workers struggle to survive on 'his' land, killing innocents because they don't conform to your social expectations.. these acts can't be forgiven because the perpetrator claims he is only complying with universal nature.