Yes but ethical responsibilities are entirely irrelevant, because that crazy person would still bioweapon you, and you kinda do not want that. So regardless of

Yes but ethical responsibilities are entirely irrelevant, because that crazy person would still bioweapon you, and you kinda do not want that. So regardless of if they're evil/bad/crazy or not, you still want to have that not happen. Hence the systemic perspective instead of the focus on the individual.