There is, however, at least one possible reason to go for LaCroix, and that's assets. Remember, Donald has basically no resources left, and LaCroix is old and at least smart enough to survive 200+ years in vampire society, where your average lifespan tends to much much shorter than normal people involved in organized crime. He probably has some holdings which are convertible, perhaps not easily, into assets. Things like "Weird Mystic Vampire Artifacts" you can render down into Prime Energy, gold coins, hard cash (vampire conservatism strikes again!)-things that vampires tend to hoard and can be convertible. This is of course probably not the most reliable way to get assets, or the safest way to get money and PE.
But it is a thing that you can also do while punching the secrets of al-Saud out of him.
See, this is the thing which the people voting for LaCroix were lacking. Actual IC incentives to do it.
Hmm.
Which means that the theme of this option is not, in fact, "revenge" - because there isn't enough theme for revenge. What the theme is actually is more like "Woo! Heist caper with the original NPC party members and Wufan subbing in for Siddharth". And I don't care that "Woo! Heist movie" isn't technically a theme. The main thing here is
not revenge on LaCroix - well, except for in the ironic Donald say, which is to say, "We broke into one of your last remaining safehouses and proved to you that it's not safe, and emptied it out" which is a more cerebral form of revenge. Which suits Donald quite well, because he doesn't like being poor - and untraceable assets are lovely [1].
Although the thought does occur to me. We still have access to Progenitor networks and Henriette will have established backdoors. If Henriette can get a blood sample from one of LaCroix's ghouls while they loot the safehouse, she can use Progenitor access to satellite networks to search for LaCroix with Corr 3, Matter 1 (because the dead vampire blood is a distinctive Matter pattern and Professor Li totally has ways of tracking down vampires). And then maybe Donald can have a little telephone conversation with him, with the threat of "if you don't tell me what I want to know, I'm telling the Camarilla where you are" hanging over his head.
(as opposed to the compact drone Henriette has zeroing in on his location, which has incendiaries and is also hanging over his head. Because he's not allowed to squeal on the party.)
[1] Donald is also a fan of how "Woo! Heist movie!" means that Rose and Henriette have to wear catsuits. Well, only Rose has to wear it, but Henriette is willing to give it a go to show good feeling. And then Wufan puts one on too because they're useful for black ops when breaking in, and so Donald is feeling left out so joins in. Catsuits for everyone!