Hidden infamy XXV reward - Bain now trusts you enough to know what you're doing when you kill civilians. He knows you're getting a chair anyway so might as well plead full blown insanity.
But seriously, all this mod does is skip all "omg, your such a bad person" lines for killing civilians , yours and, sometimes more importantly, your teammates' as well. I don't personally mind Bain as a whole but hearing the same lines over and over and over and over and over and over and over and over...
....and over and over and over.....
...and over...and over and over again does get tiresome.
Does work for Locke too, but he's not nearly as annoying and there are barely any civs in his missions anyway.
It's in "Gameplay changing mods", because you're essentially circumventing the only actual penalty of killing civilians, having your brain fried by Bain's endless flipping nagging.
Also, if you happen to know line's id, it's very easy to extend this mod to also skip those lines, if you feel like it. I won't stop you, you have my blessing, might even leave annoying lines' ids in the comments for others.