If I would be a Extraterrestrial Life-form and i do not like what i see from another Life-form, so much that i think this Planet need a Reset.
What would i do?
I would manipulate the primary Energy Source of that Planet.
Like a "seasonal Flood" would be the outcome.
If you take a look at Humanity and how we take care of each other and , from that Perspective this Kind of acting would may make Sense to a Alien Life-form.
Civilizations are build on moral and ethic Values.
Me i would not get in Contact with a Civilization that destroys it self and everything a Planet were Evil, Stupidity and Greed for a self made Product, rules.
That said:
Let all your things be done with charity.
1 Corinthians 16:14