@Murricath
That's true of all Xianxia. It's because of cultivation itself - cultivation is all about greed, since you can't cultivate without resources. Every cultivator must be incomparably greedy. You have to put yourself first in order to be strong enough to not be used and abused and robbed by others.
Then, that strength gives way to arrogance. Self-justifying power. "I have power, therefore I can use it however I want."
Because this is human nature. That greed, the exclusivity, the abuse towards things you don't recognize as 'part of your troop'. This has always been a part of us ever since we were apes. It's how we survived. "Good people" don't exist naturally, that's a function of society and civilization telling us what is good and what is bad. Which itself changes over time. It wasn't so terribly long ago that having sex with children was actually considered beneficial for them, and was a natural part of civilization. Now the very mention of it will drive us into a murderous furor. Morality changes over time. What is good and what is bad changes over time. Thus there is no concrete 'good', and thus there are no naturally 'good' people.
But these people cultivate to overturn the heavens, the become immortals and gods, to replace the laws of society with their own whims, thus they are almost utterly self-focused and selfish. All others can be treated as they wish so long as the others aren't as strong as you. This being the prevailing truth of every cultivation world that "the strong preys upon the weak", which is a common issue because it was extremely common and overt throughout Chinese history and to a sometimes more subtle amount throughout human history in general.