Real life situations aren't like superhero stories where good guys defeat evil villains. Thinking groups of people as 'bad guys' to be exterminated is a sign of bloodlust and/or indoctrination.
Few individuals can be considered villains, most just do what they believe is right with some assumptions. On a social stage, people can have different moral sets.
The writer discusses villains in stories on what they see, why they exist in opposition to protagonists and what their villain status means to them and the writer.
Villains may not always be antagonists; villain and antagonist are two different concepts but not exclusive. Crossovers from protagonists to villains may exist, even playing with lines.
In a story, villains are usually framed as being wrong or in opposition to the main characters. This may not always be reflective of what the readers understand.
In later volumes, villains will be categorized by primary motivation and an underlying reason. The writer won't focus exclusively on female villains but acknowledges female villains' reception is worse than males.
Villains may be discriminated based on the intersectionality of their identity. A Japanese female villain may be subject to Orientalist and misogynistic stereotypes.
The series will continue with a Vol. 2, which will be a character analysis piece.