There is something in the hidden captions about the dead humans as a result of what they did...shame it wasn't included in the game.:/
They were celebrating killing Mundus and freeing mankind...then the picture pans out to show the city in flames, totally wrecked and a load of dead people. It's like some kind of dark humour. Yeah...you guys did it...woo hoo *sarcastic clapping*.
Not sure if humans were better off under Mundus' control or not. They were slaves, but they had their normal lives, and they weren't aware of being controlled anway.
Then Vergil and Dante take out Virility which would make the people wake up and start to panic if they saw any demons; then they got Mundus so angry that he wrecked a big chunk of the city...and then with humans completely free of the demons, with a city in ruins, loads of dead people, and demons running around in plain sight...I'd say that would cause mass panic with the humans acting like a bunch of chickens running around with thier heads chopped off.>_<
Besides, either way, it's not like they saved humans at all. They put them in a worse situation than they were already in. And what will happen to humans when they die now that there is no Limbo and no hellgate to siphon their souls as fuel for hell and Mundus?:/ I didn't hear Vergil talking about any heaven, just hell and how humans were like attle for demons. So the souls of humanity are still in trouble.