If the Nexuns viewed the Balance and Thera wasn't Balanced because there were too many goodies, then hell yeah they should have been slaughtering Forties. And if the cabal wars command is showing a halfway legitimate picture of how things are right now, then yeah, I'd expect the Nexuns to be going after the Fortress a majority of the time. Are some Forties newbs? Maybe. But that doesn't change the Nexun's mission.
Note that if good is only tipping slightly, then Nexuns aren't obliged to hunt them, that's only if they're tipping badly. But even tipping slightly opens up the CHOICE to go hunt whichever side is tipping, and if Nexuns are making that choice right now, good for them. Beats sitting in their cabal and typing eq over and over.
It's why I like playing Nexuns so much. I don't know if people realize it, but over the course of a Nexun character you're going to get a green light to go after almost every ethos/align combination. Keeps some variety in things. Unless Fortress's numbers are bloated, then apparently you get to kick the shit out of goodies most of the time.
And there's nothing wrong with that.