Could someone use a 0day in the pursuit of self defense? eg: disable an attacker's vehicle in a scenario where lethal force would be permissible.
[1] - https://www.thedailybeast.com/this-bill-would-allow-hacking-...
However, breaking laws in a self-defense situation as an alternative to (legal) use of lethal force should result in an acquittal in any common-sense justice system.