Is their such a thing as a perfect ethos? What makes you think the Jedi ethos is more righteous then any other?
for instance..
Emiel Kant, a german philosopher once described the following situation:
You're walking in a dark alley when suddenly turns the corner, running. Then soon after a group bent on killing the fugitive appear asking you where the other man had gone. You're an honest man and as an honest man you have to tell the truth or you'd be going against your own ethos, but then again in being honest you might be responsible for somebody else's death.
So how can anybody be 'righteous' 100 percent of the time? There's no perfect philosophy.. Que sera, sera, mon ami.