A 13th century Faenzan member of the Jovial Friars from an upper class background, there are very few records on Alberigo's life. The episode that landed him in Hell began with an argument between him and his cousin over an unrecorded matter. Vengeful, Alberigo plotted how to dispose of his unwanted relative. Inspiration struck him, and, under the guise of reconciliation, he invited his cousin and his cousin's son to dinner. As soon as the food was served, however, Alberigo's servants killed the pair. For this betrayal of both family and hospitality, Alberigo was sent down all the way to the 9th Circle.
Well, he doesn't seem sorry about the incident, and there really isn't anything positive about him on historical record, so I'd say this is a pretty easy soul to judge.
But the game's Alberigo claims that he spent the rest of his life doing penance.
We're in the realm of liars. He's probably not telling the truth. Besides, in the original, didn't Alberigo's soul immediately get sent down to Hell while a demon took over his body?
That is true in the epic poem, but not in the game. However, your first point remains valid, so I'll concede.
Hope you enjoy doing that, because we're in treachery now! The worst of the worst! Nobody is getting out of here!
Perhaps.
…You're no fun anymore.