As someone who has seen the rambles of a few other game devs, I think a fundamental fact that any dev writing a story-heavy game must confront is that 99% of Players optimize for 2 things: Content and Being a Hero.
A fact of psychology is that most humans do innately possess a certain level of "Good feels Good" and "Being Mean makes me feel Bad". So when given a choice between Being Good and Being Evil, they will almost always default to picking the "Being Good" choice. This can be offset to a degree if the Evil choice offers more content than a Good choice. But a lot of games tend to make the Evil choices be Chaotic Evil, and that ends up costing content. This can be going murderhobo and losing access to a Character's storyline, or it can be something like the old HiveQuest corruption ending, which would cost you all of Azyrran's content. The end result is that when Players run the cost-benefit, they see that there isn't enough to be gained from being Evil, and thus stick to the Good path.
(And in the context of COC2, Players are always going to view Corruption as Evil, no matter how hard you try. And the Rewards for being Evil just aren't there)
In fact the only place where you typically see variance is in mutually exclusive Romance options. Because generally Romanced characters have more content to give, but having to pick one means Players have to run off of which personality they initially like more, which is varied enough to produce variance in runs. You might notice that the only Corruption-related content Players usually engage with in COC2 is the stuff that relates to Romancing Kasyrra. Because long run that's going to be the way to redeem her with the power of love, and currently if you don't Romance Kas in Winter City, you can swap to the Romance path at the end of Khor'minos, but you end up losing out on an entire character as a result. (And while you can get this character if you don't Romance Kas, the Character in question only gives their story quest if you have another quest that is exclusive to the Romance-Kasyrra route. So if you want all the benefits you have to Romance Kas anyways.)
(The sum of all this optimizing is that Players suck at Free Will outside of Romance options. Look at the original COC, where we all ended up on the same path "Hermaphrodite romances a bunch of people and then Redeemed Lethice." The more a dev works on giving the Player options, the faster you end up at the "You are all Individuals" scene from Life of Brian.)