Foolishness, selfishness, or ignorance.I didn't explicitly state that, though it captures the spirit.
Really, it's simpler: Unless you're a Evil jerk, why would you ever actively oppose Good? And can you (ENWorld poster) contrive a reasonable basis for someone to do so?
You could delude yourself into sitting on a fence, convinced that being "In the Middle" is superior, but it's ultimately a foolish position. You allow evil to exist, or even assist evil, because you think good is "Just as Bad" as evil and vice-versa.
It's the horseshoe theory of morality where good and evil are fundamentally the same thing and the only solution is to stick your fingers in your ears to the screams of the innocent harmed along the way because at least you're not the one harming them.
This is, by it's nature, a fundamental misunderstanding of the conflict between good and evil in every story and also in reality.I like this idea.
Muscular neutrals want to prevent the conflict from escalating.
Good wants to prevent the conflict from escalating too but, by themselves, they can't. Their gains cause Evil to escalate the conflict, which is bad for everyone--and Evil's gains force Good to escalate, for fear of losing and allowing more people to come to harm by Evil. Escalation might just mean sending more outsiders and empowering more mortal vessels at first--but everybody knows that world ending power is on the table if things escalate too far.
Good is a Reactive force. Evil is an Active force.
In the status quo, good seeks to improve things for those most harmed in a society to try and bring up the worst-off. And they do this largely through altruism: Giving of themselves to help others. Sure that can mean fighting dragons and defeating liches, but it's also charity or working in a soup kitchen or building an orphans and lost puppies hospital and orphanage.
Good responds to the ills that exist and selflessly gives of it's own attention, emotion, energy, and resources to fix the problems that exist.
Evil, on the other hand, actively seeks to do harm. Evil bans books and makes discriminatory laws, evil attacks innocents and steals money or food or the candy from babies (not that babies should -have- candy, but you know what I mean). Evil is not a passive force, it is an active force that seeks to gain for itself regardless of whom it harms along the way.
Good doesn't "Make Gains" against evil. Good fights when evil rears it's head, and the rest of the time it just chills out and helps people live their lives.
Meet me in the middle, says the unjust man.The two can't maintain a peace between themselves because Good doesn't trust Evil (justifiably) and Evil doesn't trust Good.
They need a 3rd party guarantor--the muscular neutrals. Muscular neutrals have to fight both sides, or they wouldn't work as a guarantor. Generally they spend more time fighting Evil ...because obviously. But if they don't also fight good, Evil will just escalate the conflict as they would have when threatened by good.
Neutrals, even "Muscular" neutrals, favor the status quo. They'd rather keep the peace than seek justice. Even if that means allowing harm to continue or even explicitly taking part in harming others.
At best neutrals are willing to push back when evil goes "Too Far", but are happy to let innocents suffer so long as it's not "Too Many" innocents. And there's no universe where that isn't a messed up way to be.
And a fundamental misunderstanding of active and reactive forces.It requires no special cosmological justifications, just the logic of escalation.
Yeah... There's very few versions of reality in which Neutrality is "Pragmatic". It's mostly just a bunch of fence-sitters allowing awful things to happen to "Someone Else". 'Cause as soon as the druid's grove is next on the chopping block -suddenly- evil has gone "Too Far" and must be fought against. Nevermind the villages and cities that have fallen to evil away from the grove...It also gets us to the jaded I-know-more-than-thou wizards from secret societies sadly or stoically doing what they see as their duty to destroy the forces of good (and druids, which the preceding sort-of describes)--which, I think, is what many of us imagine muscular neutrals to be.
Sidenote: I'm leery of the term "pragmatic", it's essentially consequentialism with a bunch of unstated goals and assumptions snuck in.
I think that's, in the end, the core of neutrality. Being uninvolved until threatened, -then- choosing a side. And they only consider the "Balance" threatened when good is winning the fight.