Because the better the Fortress is doing, the harder Nexus will actively be working against that, to promote evil. Doing evil, and thus BEING evil. Nexus really ought to be considered everyone's enemy, because the harder you work to achieve your cabal goal, the harder they will work to oppose you. ALWAYS. That is their function, and if we were looking at this with real world perspective, that WOULD make them everyone's enemy at all times. I totally get what he is saying.