And, did Vader ever kill everyday Stormtroopers? I thought he just put the occasional squeeze on some of his incompetent officers.
A lot of who Vader is changed since he started as the ultimate evil villain into a f'ed up guy who got played into turning to the dark side, screwed by Palpatine, and died to save his son. I remember either in Dark Lord: Rise of Darth Vader
or the Path to Nowhere
comic Vader saying something to the effect of not having time for the BS from the whiny, ego-fluffing officers, but really feeling a connection with the troopers left over from the Clone Wars and the fact that they both had armor.