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
It's because settler-colonies are inherently genocidal. The settler-indigenous dialectic functions different from the bourgeoisie-proletariat dialectic or the aristocrat-peasant dialectic. Those other dialectics can be generalized as a master-slave dialectic where the master oppresses and abuses the slave but is still reliant on and can't truly get rid of the slave. The settler, unlike the master, doesn't need the indigenous. In fact, the settler needs the indigenous gone asap in order to steal their land and other natural resources. Therefore, the settler-indigenous dialectic can be resolved not only with the overthrow of the settler-colony by the indigenous like all oppressed groups overthrowing their oppressors, but it can also be resolved with the extermination of the indigenous at the hands of the settler. This inherent genocidal goal of settler-colonial society leads to settlers upholding genocidal ideology and in general, acting like deranged monsters.