If we want to pretend we're on the Lampblacks' side, that's fine by Yonah, but she's going to tell you that a rogue never forgets when they've been wronged.  And we've wronged the Lampblacks especially; we might make nice with them now, but all it'll take is one thing and we'll be back on their shit-list.  OTOH, a friend is a friend unless you majorly backstab them.  IE, we're in good with the Reds now, we should stay that way and make sure that the Lampblacks get wiped off the map.  (Who takes over their territory and whatnot is a secondary matter.)