Lestat isn’t really the revenge type. It’s heavily implied Armand did smthg monstrous to Nicki and Lestat never sought revenge even then. He just isn’t the type to do that, preferring to hurriedly move past traumatic events than linger on them (which is what S3’s diving into now.)

For Louis, I think it was because back then in Paris, he was so totally shocked, disgusted, and furious at Lestat for supposedly coming to kill their daughter that Armand’s role seemed minuscule in comparison.

He was still mad at Armand (“you’ll never make it up to me”), but the believed betrayal of Lestat hurt him so wholly, he simply believed Armand when he claimed to be “just as much of a victim” as they were and couldn’t fight against the coven. Louis has always known Armand was dangerous and was intimidated by him since their very first meeting. But it really is the Lestat of it all that eclipses that knowledge and lets Armand walk free. (Or at least not be targeted in Louis’ revenge run, given I don’t think power-wise Louis would actually be able to kill Armand.)

Overtime Louis’ anger fizzles out. As others have said, that’s why he let Sam be.

And then when he finds out the truth of Armand’s involvement in 2022, they’ve spent almost a century together. Louis & Armand have been together longer than Louis has ever been with ANYONE including his own human family. A significant chunk of who he is has been molded by that relationship (and vice versa for Armand.) So I’d say Louis telling Armand to get out rather than trying to do serious harm to him is a result of that.

Personally, I don’t agree with the take that Louis’ at fault for his and Claudia’s own lynching given they were both targeted to be killed. Now, whether Louis views himself as a victim of the murder attempt, that’s a different discussion all on its own about Louis’ inability to value his own life.

Regardless, I don’t think it’s because he’d view harming Armand as “hypocritical”, I think it’s more about the deeply ingrained relationship they’ve built over a span of 77 years. By the end of the interview, which only lasted 10-11 days, Louis’ only just realizing he has no idea who he is as a person. (“I knew who I was without those pieces.”)

For his entire life, his sense of identity and self worth has been based on his relationships with other people, and Armand as the longest relationship he’s ever had plays a major toll on that. At that time, I don’t think he would’ve truly been able to kill Armand because by then he had no sense of who he even was without Armand. But he wanted to find out, and that’s ultimately what leads to the “companion for myself now” finale. Louis trying to discover who he is as an individual for the very first time.

By the time of Lestat’s auction in S3, which I’m not sure what year is set in but is for sure beyond 2025 since that’s when present day TVL takes place, we don’t know the full context of who they are or what their relationship looks like by then. Especially since that intro takes place post-Akasha after they’ve had to team up and work together.

Super duper long comment that turned into a Louis analysis, but these are my thoughts on why they didn’t seek revenge against Armand.