TST Ethics favors preservation because existence carries value. Life, structure, ecosystems, cultures, and even landscapes represent accumulated order — the result of time, causation, and complexity unfolding. Destruction may sometimes be necessary, but it always demands justification.
Preservation is the default because flourishing depends on continuity. Living systems take time to develop. Social stability takes generations to build. Even natural beauty reflects structured existence. To eliminate something casually is to erase layers of reality that cannot easily be restored.
That does not make preservation absolute. Ebola may be eradicated because its continued existence produces overwhelming harm. A mountain may be mined if doing so prevents greater suffering and if restoration is possible. But destruction must be weighed carefully, and reversibility matters.
TST Ethics asks: Is this destruction necessary? Is the harm justified? Is there a less damaging path? When preservation supports flourishing and reduces unnecessary harm, it is morally preferable. When destruction produces greater layered flourishing with minimal long-term loss, it may be justified — but never trivial.
Preservation is not about freezing the world in place. It is about respecting the weight of existence before deciding to alter it.