[@Lady Sven] I have posted my bio in the CHAR tab.

The Order is ambiguous in morality, and so I want them to be viewed negatively.  But whatever you think of them, they're a necessary evil (at least, in my head-canon).  No one else is willing to stand on the ramparts in some gods-forsaken wasteland like the Knight-Brothers; no one else is willing to commit the atrocities they are willing to commit.

Then again, that's just my head-canon, take it and use it as you will.

On another site, the Brothers would attack pagan villages in the midst of the night, drag the occupants into the streets, and then force them to convert.  Those who agreed were put on wagons and escorted to pacified lands where they were given fertile land and good protection.  Those who refused were brutally butchered in the street, in front of everyone, as a warning to anyone else who might oppose the will of the Brotherhood.

EDIT:  At that time, the Brothers were trying to purge that area of a specific kind of worship; they did so with brutal efficiency.