Angelo seems to fit well into the SWORD mold, which is "well-intentioned extremist". Which, yes, makes them villains, but it's a bit less simplistic than that.
Yes and no. The person directed the Hollows is a SWORD agent...But I'm pretty sure SWORD didn't order this to happen. He's doing it on his own, I think.
I think Nick's addressed this.
This is absolutely right, and it needs to be emphasized: The kids are supposed to win this one on their own.