I don't usually use 'evil' to describe things but I don't know any other word to describe settler states and their tendency to massacre and torment people they stole their land from and gleefully brag about all the horrific atrocities they've committed/want to commit. Never before have I seen a group people that take more joy in the suffering of others than the kinds of people that want to wipe out entire societies and claim their land for their own.
This is the kinda shit where if you write villains that act exactly like this people will slam you for bad or unrealistic writing, but no, it would actually be perfectly in line with reality all things considered.
EDIT: ps I know me not good at writing things. Wish I can write my thoughts on this better, but I can't really get it into right now
In Debt: The First 5,000 Years by David Graeber, he talks about how the conquistadors were at the lower levels of some kind of debt peonage pyramid scheme where the low-level soldiers owed a certain amount of gold to Cortés for organizing and outfitting the expedition, who owed a bunch of money to various creditors including the King of Spain, who owed a bunch of money to various bankers in Venice etc. So they were financially encouraged to be as brutal and extractive as possible when they gained power over the Native peoples. Graeber describes it as one of the first building blocks of capitalism, where those in power had no responsibility other than to extract as much wealth as possible from the people they had power over.