I've heard this justification many times, but it's highly questionable. Imagine someone works for an organization, and 'the rules and constraints' require them to murder (without legal consequence) innocent people on a regular basis; is this morally justifiable? What if their 'job description' does not include 'murder', but they do indeed have to murder an innocent person each month because of the 'rules and constraints'? What if instead of occasional murder, they just have to subject many innocent people to suffering because of 'the rules and constraints'?
This isn't a hypothetical, you're just describing social murder. What do people do about it? Usually shower the perpetrators with money and peace prizes.
That is war.
> Imagine someone works for an organization, and 'the rules and constraints' require them to murder (without legal consequence) innocent people on a regular basis;
Several large corporations really are guilty of murdering innocent people on a regular basis. Even still, if you find a low wage worker in that company's mail room and beat the shit out of them to make yourself feel better it's you who are the asshole, and it does nothing to stop the killing.