I can see it now: just get the enemy to breathe in a cloud of nanobots, or have the bots enter their body through an open cut that they make, and the enemy’s body is yours: no violence needed.
We live in a terrifying time because there’s just no way to dodge this sort of stuff unless you have the EMP tech, since a Hazmat suit is unsustainable to don long-term.
It’s arguably a lot easier to terraform a planet when we don’t have to worry about messing up and killing off our entire species. Though the are some who would make the argument we’re doing so anyway