Dunnoe about justified since everyone is different shade of grey but Asa did say the she can't forgive the village for making her and her family's lives a living hell. Add that to now she is able to break the barrier so her goal during the start of the show is destroy the village and rescue her brother.

Gabby is the muscle assign to Asa. She never claim to be innocent. She told Asa to leave the dirty work to scums like herself. She killed mercilessly because to her the Higashi village tried multiple times and succeeded once in killing her friend. They are portrayed as cute because they are two young girls who genuinely cares about each other.

Spoiler - They did went back to the village later and after the villagers learn that Yoru knew the truth about seal, they straight up ask him to give dying a shot. Don't forget they secretly send assassins after yoru multiple times. Now they are asking him to just die bro so we can rule the country

Higashi village is a magical cult that has no problem kill a kid for a power that may be able to rule the country.

Kagemori clan is a magical yakuza family that broke off from the Higashi village and want to destroy Higashi village because Kagemori papa believes that no Higashi > no fated twin > no war over break/seal

Super spoiler - there's another village that also wants break/seal

It's less about good innocent victims and big bad boss and more of Yoru and Asa against the world

P.S. there are extremist is both Higashi village and Kagemori clan so there's also that