Hussar
Legend
Continuing to screw up and pretend it's just because you've screwed up in the past is not a good justification.
Also, depends on the scale of what is introduced. Adding in a race isn't as bad as adding in "another" deity when the line up is already over crowded is a bit much.
Making changes for the sake of changes is also a problem that a lot people have, especially when it's extremely obvious *coughs* (dragonborn).
Hrm, adding one more god to a list of several hundred isn't going to change the setting anywhere near as much as adding a new playable race, which will crop up in FAR more games than yet another deity. What "justification" is there for adding Tieflings and Genasi to the setting? After all, was the setting somehow missing not having plane touched races? Was there some need that wasn't being filled? Or was it that the makers of D&D had a new race that was gaining traction among players, getting popular, so they stuffed it into the flagship setting? I'm betting pretty hard on that last one.
If you're going to complain about Dragonborn, why are you not equally complaining about Tieflings and Genasi?
Heck, if you're a Realms purist, which you've complained about Tharizudun being added to the Realms, why are you okay with Lolth in the setting? After all, Lolth is a Greyhawk deity LONG before FR was even a gleam in anyone's eye. Heck, the most loved module series of all time features Lolth and is set directly in Greyhawk. So, shouldn't you be just as loudly decrying the pollution of FR with Lolth?
Or maybe Gruumsh and Corelon? After all, both of them predate FR by darn near a decade, and both are firmly Greyhawk deities, complete with backstory of Corelon putting out Gruumsh's eye. Shouldn't that be a prime target of your ire in polluting the setting?
The ship sailed years ago for trying to claim any purity to Realmslore, either from outside influence, or continuity. Why should Spell Plague be treated any differently than any other event. Heck, from a continuity standpoint, there's no real problem with Spell Plague - it fits within the established lore of the setting. Continuity is not defined by personal preference.