Yes, I know they're both banned in vintage for silly reasons, but I honestly don't see the need for either of them to be banned in EDH just for that reason. Particularly since it's a singleton format.
There's a combo that uses Worldgorger Dragon, Animate Dead, Entomb, and an instant speed kill spell to generate infinite mana on turn 2-ish. Yeah, that's great, but requiring two specific cards being played and resolving to generate infinite mana isn't nearly as cheap as, say, anything you can do with Rofellos and an untap effect like Umbral Cloak or whatever it's called. So the precedent of unbanning Rofellos sides with the unbanning of Worldgorger as well, particularly since it isn't that great of a card other than that combo and would only see use in very niche decks to limited success.
As for Library of Alexandria, it isn't good in a format like EDH at all. The amount of times one would end up with exactly seven cards in their hand is low. Sure, if you drop it turn one you can tap it on your next turn to draw a card, but if you are keeping yourself at seven cards just so you can draw more you're probably going to end up losing anyhow since that requires playing nothing but land every turn. Another thing to keep in mind is that it is, again, only a single card in 100, and drawing cards at the expense of playing things is generally a detriment in multiplayer games. I can see possible reasons for banning it in 1v1, but definitely not multiplayer.
So please, discuss. I'm completely against the banning of cards that shouldn't absolutely be on the list, and I feel that neither of these deserve it. And yes, I did register on the forum just to post this topic.
