He's a strange guy for sure. He also claimed he would never work for DC again , but took a paycheck for the ABC line which was an imprint of the company. 

How is the latter childish?  Superheroes are vigilantes and vigilante justice pretty much, philosophically, falls on the far-Right of the political spectrum.  Therefore, it is not a stretch to say that superheroes represent a fascist approach to order.  You may not agree with those views, but they are hardly "childish."

Superheroes, as published, represent wish fulfillment and have represented both sides of the political spectrum, in publication history, depending on the views of the storytellers; but, the basic concept of unsanctioned agents imposing their own view of law and order on people is pretty much from the fascist playbook, when you look at the history of the rise of the Nazis and Italian Fascists.  The SA acted as vigilantes, attacking those who didn't fit into their narrow view of things.  So, Moore's statements aren't completely unfounded.  They do ignore the many stories of superheroes acting as agents of social improvement, such as the early Superman stories where he fights slumlords and war profiteers, or the JSA helping to feed starving people.  Like many debaters, Moore has selected material that supports his thesis and ignored that which does not fit.

 I'd like to suggest that there's a difference between a capital-F Fascist and a lower-case-f fascist. One need not be a member of a Fascist party to act in a fascistic way, just as one need not be a Democrat to act democratically.

Superheroes, like the ancient gods they resemble, act in whatever way they deem necessary to achieve whatever goal they feel they must achieve. Gods and superheroes mete out what they may term justice, but what most others would call revenge or retribution. They operate outside the law, at least the law as defined by liberal democracies, and are assuming the roles of judge, jury and occasionally executioner. 

Deputized or not, they are vigilantes. Do they belong to a Fascist party? No, but by sublimating the law to themselves, essentially putting themselves in the role of the state, they are acting fascistically. 

Most superhero comics can't bear up under the weight of this kind of analysis and examination; they were meant as harmless wish-fulfillment fantasies for kids, but like many another art form originating as uncomplicated entertainment and thought to be ephemeral, like Westerns, sitcoms, musicals, and war movies, they have been scrutinized, reshaped and reinvented.

Like prisms held up to the light of -- in this case of progress, scientific advances, societal change, etc. -- they reflect something different than they did originally. And we see in them aspects of covert and overt racism, misogyny and yes, fascism.

So, no, I wouldn't criticisize Moore for questioning and examining the medium in which he writes.

Yeah this exact example is what broke me from seeking out his work.  

In what issue of X-Men did that happen? 

With all due respect, it’s not fair. Moore could have quit once the company was sold to his enemy. I heard that he really liked doing the ABC line of books as the reason he looked the other way. This is why it’s important to never say never.