I'm well aware, and I'm certain the Flood was the inspiration for Cataclysm. But that's the thing - you can claim to be in charge, you can claim to be righteous if you do that sort of thing, but you can't claim to be Good by the meaning of Good in D&D, because that doesn't allow for murdering millions of innocents because you're also killing some bad dudes (even if they outnumber the innocents).
And the Dragonlance gods are explicitly comprehensible and explained their reasoning. It was just utter bollocks that makes monsters of them (in the earliest pre-retcon form).