system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Killing sand people is rough and all, but what's the evilest thing Darth Vader ever did?
gpt
Let's not forget casually choking every imperial officer that fails him to death, that's not pleasant.  


in the comics he drowns a whole town just to cause a distraction to a Jedi who he was hunting for lightsaber.  


he hunts down an escaped Jedi, who had gone on to make a nice, force-free life for himself in hiding, kills him in front of his own children and his wife for good measure.  


after brutally torturing Leia in the death star he rewards her with a present, a hunk of rock, a souvenir of all that was left of Alderaan. Not as brutal as he can be, nor is it a huge display of force power, but super savage nonetheless.

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returns to tattoine later in life as Vader and just for kicks slaughters a bunch of sandpeople again.

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turns two stormstroopers' heads 180 degrees with the force all because they caught a glimpse of him without a helmet completely by accident. Hell, one of them was mid-apology and trying to help him.

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Force chokes and puppeteers a ruler of a planet that recently come under Imperial rule. in front of the ruler's family and other planet officials, because the guy said it was custom for people to dance on this particular occasion. Yes the dude was being a dick and oddly insistent that Vader dance, but it was pretty extreme. He was also concerned the people of this planet weren't yet certain who was actually in charge now.  


in the legends run he decides factory workers constructing AT-ATs that they are working too slow. To motivate them he informs him that at the end of each work day and kill the least productive worker. To motivate them. Constructions ends in record time but with fewer workers.  


Also in legends he throws an aspiring and hard working imperial officer off a balcony on Coruscant because Palpatine hints he worked as well as Vader, and Vader didn't suffer potential rivals. He made that same officer beat several prisoners to death with a rod to save the power pack in his blaster.