Why is Geralt called the Butcher of Blaviken

[Maybels]

Through out the three games i'v heard a lot of people refer to Geralt as "The Butcher of Blaviken" but exactly what happened there has never been covered. I assume he earned the title in the books but since I don't speak polish I haven't read them. Does anyone know what happened there and why he earned the title?

[Oldbastage]

引用自 Sir Fox III：

引用自 Sadman :(：

It's a reference to the short story "the lesser evil" in which Geralt murders 5(?) bandits quite adeptly in order to stop them from murdering a dude. The peasants are unaware as to why he did it. They only saw him do it. Therefore they labeled Geralt as the butcher of Blaviken.
Also - the books are translated to English and they are widely available. I highly recommend them!

Oh, well that pretty much loses all meaning when Geralt never goes 5 minutes without quite adeptly murdering large groups of people in full view of several peasents.

You could read the story and get an understanding of why he did it and why the theme of lesser and greater evil is prevalent in the game. The story is also where his monologue in the Killing Monsters trailer is taken from though that's a shortened version.