I've never actually watched Trigun but doesn't Vash have a thou shalt not kill policy stronger than most of the DC and Marvel line up?
Yes, one that is portrayed as borderline suicidal, given the amount of damage he soaks up, rather than use lethal force to defend himself. (Not to mention the property damage that ensues due to Vash prolonging battles). The show portrays this as foolish, especially given the dangerous lunatics he goes up against.) The show all but outright states that Wolfwood's adoption of Vash's ways