Well disruptions of a system eventually lead to new, different forms of stability where things will settle down. I can't imagine life is as fragile as you make it.

Having the ability to kill all complex life sounds like a misconception humans made up. After all, humankind always liked feeling important, feeling special and putting itself in the center: pretending they life at the center of a disc, pretending the whole universe revolves around the planet, pretending only human bodies were inhabited by an eternal soul, pretending an all-powerful being cared about them, pretending they're the peak of evolution, pretending machines could never outperform them.

Humans always try to find new things that make them unique and set them apart from other forms of life. Yet they keep getting disproven.