Monsters Inc. Lost Sequel

Where do I begin? Who I am is not important, and what I do is not important. It's what I SAW that's important. I found it at Goodwill. At first, it seemed like a regular VHS copy of Monsters Inc. Then I opened it when I got home. There was no label on the tape, just "MOnSterS TWo" clawed onto the tape. Thinking that a small child had removed the label and scrawled that on, I didn't give it much thought. I just popped in the tape. The movie I was seeing was not the first Monsters Inc., but rather what looked like a bona-fide sequel. I was amazed as it was fully animated. It opened right where the first movie left off, with Sully in Boo's room. Initially, Sully is happy to see Boo, but then he realizes that he's not seeing boo. Its a man sitting in Boo's bed, pretending to sound like Boo. Then he shoots sully with a shotgun. Then the man goes through the door into Monster World and started to shoot mike. Then 700 more men come through the doors and shoot all the monsters. Now all the monsters are dead and the first man turn to the camera and says: "Men will kill anything they don't understand". Then the tape ended. I was sad and I cried. Then I went to find something that I didn't understand so that I could kill it.