Indeed, it is the point.
Right, I forgot what the point was
But even so, Sirion does have the reputation going as the evil empire. Maybe it is the size. Maybe it is the elf-theme, maybe the reputation is just natural because she has many enemies. In either case, it does exist.
So even if Sirion hasn't actually killed a lot of small realms for no reason many have the perception that it has. Perception matters