Why didn't Vader kill Admiral Yularen?

He ordered the killings of Owen Lars and Aunt Beru, two individuals who barely knew personally—definitely not to the level that he did Yularen.

“Lord Vader,” said one of the sandtroopers, adjusting a control on his helmet so that only Vader could hear his voice. “The Jawas sold a protocol droid and an astromech to these moisture farmers, but both droids are gone.”

Moisture farmers? Intrigued, Vader examined the holograms of the kneeling couple and said, “The farmers’ names?”

“Owen and Beru Lars, sir,” the sandtrooper responded. “They say they don’t know where the droids are, but it looks like a landspeeder is missing from their garage.”

Owen and Beru, Vader recalled...

“Tell Mr. and Mrs. Lars that they seem to have trouble keeping protocol droids on their property.”

Not certain if he had heard correctly, the sandtrooper said, “Sir?”

“Then you may extend to them every courtesy that you showed the Jawas before you continue your search. Establish checkpoints to detain any droids entering Mos Espa or Mos Eisley spaceports. And one more thing.”

“Yes, Sir?”

“Do not stop transmitting until I break the connection.”

“Understood,” said the sandtrooper.

Vader watched the sandtroopers carry out his orders on their helpless victims. He found the sight of rising flames — even holograms of flames burning millions of light years away — to be most satisfying.

From The Rise and Fall of Darth Vader

So he's trying to rid himself of Anakin Skywalker; why not kill Yularen?

Admiral Yularen became one of the Empire's higher ups, as the Deputy Director of the Naval Intelligence Agency. So Yularen was one of the Empire's assets and on top of this, Vader didn't exactly butcher the 501st because they served under him as Anakin.

That and Anakin/Vader hated the Lars family, because they just gave up on his mother...which is noted in that same novel.

When Anakin arrived back at the Lars homestead with his mother's blanket-wrapped body, Cliegg Lars, Owen, Bern, Padme, and C-3PO emerged from the entry dome. They watched in silence as he lifted his dead mother from the bike and carried her toward the dome's doorway. Anakin was in no mood to talk, and he had reconsidered his assessment that the Lars family was made up of "good people."

What's the advantage of being good if you're weak?

His grim, scowling expression locked onto Cliegg Lars, who lowered his gaze.

Perhaps you 're wishing you hadn 't given up on her so soon?

Without breaking stride, Anakin redirected his glare at Owen and Beru.

Maybe my mother never told you about how to be prepared to take care of things?

Soo...I mean he didn't need to know them personally, but they were in part responsible for his mother's death.

Originally posted by Zenwolf
That and Anakin/Vader hated the Lars family, because they just gave up on his mother...which is noted in that same novel.

Soo...I mean he didn't need to know them personally, but they were in part responsible for his mother's death.

Originally posted by Rockydonovang
From the excerpt it seems that anakin was blaming them rather then they actually being responsible. Could the Lars actually have done anything there? Anakin called them "weak" as in powerless

Well ok maybe they weren't responsible for her death, but they still just gave up on her. Though granted, it could just have been in the heat of the moment thing since prior, Anakin shouldn't have blamed them because they were only human.

I mean they did try to save her with some other friends/farmers and most of them were killed and Cliegg Lars got his leg taken off. After that, he and Owen just kinda gave up. So I'd imagine there's some hate there still.

Originally posted by Zenwolf
Well ok maybe they weren't responsible for her death, but they still just gave up on her. Though granted, it could just have been in the heat of the moment thing since prior, Anakin shouldn't have blamed them because they were only human.

I mean they did try to save her with some other friends/farmers and most of them were killed and Cliegg Lars got his leg taken off. After that, he and Owen just kinda gave up. So I'd imagine there's some hate there still.

Yea it's just anakin being angry, which doesn't really detract from your point anyway. It also foreshadows anakin turn with him calling those who are powerless weak.

Originally posted by Emperordmb
Admiral Yularen became one of the Empire's higher ups, as the Deputy Director of the Naval Intelligence Agency. So Yularen was one of the Empire's assets and on top of this, Vader didn't exactly butcher the 501st because they served under him as Anakin.

Yularen @ level 50 Flashpoint boss at Temple of Sacrifice, in SWTOREPEDIA true avatar of darkside