How does the swearing seem unecessary? It conveys a sense of anger and frustration, and above all disgust at what he's seeing. It might be a bit colloqueal (lol spelling), but there's nothing inherantly wrong with it.
And damn, this is a lot of exposition. You tell way too much, but don't show enough. The narrative style you used for the prologue really does make that impossible, too. So, uh, on first glance, my only real suggestion is to drop this whole section, and rewrite it with some actual action. Find a better way to convey Notorious's backstory than by having him tell us all flat out. Maybe find a way for him to bring it up in conversation with a character or something.