Sucker Punch Talks More About Infamous: Second Son

Why does this sound (and look) so much like Prototype?
And doesn't this completely destroy Infamous 2's evil ending? What's the point of making two endings if SP then decides to erase one from existence? And considering how perfect both endings were, the simple act of making a sequel lessens its impact. (see Bioshock 2)

Good point, but a lot of games have sequels and just go with the good ending of the previous game. I believe Metal Gear Solid did this with Meryl. Oh, and Star Wars: The Force Unleashed would be another example.

It happens in Star Wars games a lot, going back the Dark Forces 2: Jedi Knight and Knights of the Old Republic. I think there was an article that stated its by design in Star Wars that most characters are inherently good in the overall canon, regardless of how individual players choose to play.
Any game with a morality system that doesn't want to directly tie in individual players previous plays is going to have to choose a story and go with it for the sequel. Even those that do don't always have two entirely different experiences for returning players. Mass Effect 3 did it from Mass Effect 2, what was the point of either destroying the Collector Base (Good) or keeping it (Bad) when the Illusive Man still gets the tech from it in 3?

"Morality bars" ignore a whole host of truly gray moral choices, and are frankly outdated. These games love to purport choice, but the only real choice if you want the best powers is to evil be an almost absurdly evil sadistic-for-the-sake-of-it prick or a completely benevolent saint. You want real moral choices? Play the Walking Dead. No bar. No special prizes for being "good" or "evil". Just a little girl's opinion.

And when you upset her it crushes your soul. Amazing storytelling.