I remember an old article (Atlantic Monthly, circa 1980s?) that characterized the multiverse/quantum physics as a perfect future religion because it allows all of us to imagine that somewhere, in another universe, we are better off.
The guys at DC would find themselves lumped in with "flat-earthers", "holocaust-deniers", & other fringe kooks.
And they aren't already?

Okay, maybe not holocaust deniers --but what would you call the wanton desctruction of untold billions of lives (albeit in fictional universes), followed by an editorial fiat not to discuss this destruction or the lives lost (ie, Supergirl; Mr and Mrs Superman)?
Reverse-Big-Bang-deniers?