Luthen is the cold operative the Rebels needed in order to get a future where such people were no longer necessary. I get why some fans think he's too brutal and unforgiving, but the Rebellion was teetering on a tightrope where it could have gone either way and all depending on whether or not the secret Imperial superweapon could be stopped.
In real life societies tolerate even worse to get to noble ends.
In real life societies tolerate even worse to get to noble ends.