The name Medea means to ponder or cunning. In literature, Medea was a sorceress who helped Jason acquire the golden fleece, then he left her for another woman.
So yeah, I understand Medea's anger and god do I want her to fire it up and burn them all lmao.
EDIT: LOL why are some people so angry that we support the mc. Well maybe, just maybe, I'm tired of evil characters that are actually sheep in wolves clothing. Maybe I want someone who is ruthlessly evil and does not have to hide that fact, as well as does not deny it. The people she killed may be innocent, but the commoner was talking shit of her and her family (with implied desire to monopolize her) and the knight will sooner or later do something to her in service of his master. There is so much more to her and this story, also, let people enjoy