They had remnants of a Sect that tried to take over everyone else working at an outpost. These remnants had nothing to do with the war as they were all sick or elderly, so working them to death served no purpose other than cruelty.

[ He sighs. ]

I didn't go about this in the best way, I'll admit. I killed cultivators from that Sect.

[ There's more to it because there always is with these sorts of things, but he thinks Wang Lu will at least understand part of the reason why he was kicked out. ]