Because we can't ignore Tarkin's other best friend.
by lord Martiya
Year 1 of the Empire: Wilhuff Tarkin's friend, Armand Isard
"Hum... Not bad." Armand Isard said to his new subordinate after examining his old group's organization. "I'll be honest with you, I was expecting a mess."
"You serious?!" Ishin-Il-Raz replied. "I'm not some demagogue! That's the difference between the Commission for the Protection of the Republic and other groups: I know how to organize things, and when I'm working with more skilled people. Why otherwise it would be us and not someone else to be merged with the Imperial Security Bureau to form your new Commission for the Preservation of the New Order?"
"That was more about some of your more... mercurial subordinates. You, on the other hand, know your job." Isard wasn't going to admit it, but he had almost refused and remained with Imperial Intelligence when the Emperor asked him to take command of the new COMPNOR. Then again, the old COMPOR tended to appeal to fanatics, and he feared Il-Raz wouldn't be up to keep them in line. "Now, about the security..."
"We were a non-government organization, no matter how many of our men were in the Navy. All we have in this building is the best we were allowed. Though I've already contacted the Imperial Engineering Corps fo-"
That was when the window of the COMPOR director's office shattered and Isard's head exploded.
"A slugthrower at one kilometer?!" Ishin-Il-Raz shouted as he heard what inspector Divo's men had just said. "What kind of slugthrower can be that powerful?!"
"An Urthhan slugthrower." Divo replied. "This one uses ammunition originally created for anti-aircraft machine slugthrowers, and has a diameter of about thirteen millimeters, and long sixty. They're going to steal Czerka's market, one of these days."
"Sorry, what?" Tarkin asked to the late Isard's lawyer.
"Director Isard trusts you to take care of his daughter. That's written clearly in his will." the lawyer repeated. "Apparently, he fears some of his relatives could twist her, while you, as his best friend, are more trusted. The only provision is that you don't leave her alone with Raith Sienar."
"A wise provision. And I suppose it's only right."
The rest of the people attending the reading of Isard's will thought it was a friend talking. Tarkin, on the other hand, thought it was right because it had been by his order that Armand Isard had died-if someone could expose him as an opposer of the Emperor it was him, and he owed him that for knowing Palpatine's plan the whole time. On the other hand, he'd have to make sure to keep little Ysanne away from his relatives, lest they turned her into a sociopath...
notes
Here you have it: the fate of Armand and Ysanne Isard. At least in part. And given how people raised by Tarkin grow up, she won't become a psychotic Imperial.