It's about a girl with DID (Dissociative Identity Disorder)
I know I'm going to get flamed because some will say I'm looking too deep into a "slasher", oh well.
Halloween 2 is about Laurie coping and living with D.I.D. (Dissociative Personality Disorder). This is a disorder where a person possesses two or more personalities. There are many instances in the movie, and deleted scenes, where it hints at Laurie having D.I.D.
I want to start off by stating the obvious -- Michael Myers died. He died at the end of the remake. Rob Zombie intended to make Michael Myers human, so how can he survive a shot to the face with a revolver? I know, I know, "he just got grazed". There's no way in hell a little graze can cause that much blood to splatter all over someone. You can say it's "movie magic" or it's just a movie, but he intended it to be realistic. Besides, if he got grazed, why did he just lay there? Why not finish her off? Grazes don't kill you temporarily.
In the mid-way point of the remake, the janitor tells [young] Michael Myers to live in his head. He tells him the only way he can survive is to essentially create an alternate reality to escape, and that it's okay to do so. At this point, we've already seen him brutally murder his bully and go home as if nothing happened. Then he kills his entire family and later on has no recollection of that ever taking place. With D.I.D. one personality is never aware of what the other personality is doing or has done. It's almost as if it's a completely different person living in your body as a vessel. With that being said, it kind of seems to be implied that the disorder is already in the family bloodline, so it could've been passed onto Laurie.
The question comes up: "If Laurie had D.I.D., then why didn't she show any signs of it in the remake?" Simple, it doesn't always come to fruition from birth. Anything could trigger that in anyone, and tack on to the fact that it may have been hereditary, it was bound to happen eventually. What could trigger D.I.D.? Sexual, emotional, physical, and/or mental abuse. What could've happened to Laurie to trigger the disorder? Seeing her friends on the brink of death, seeing her other friend's cold, dead, naked body in front of her, being kidnapped by this seven foot tall giant with a moldy mask, being thrown off a balcony after falling through the ceiling, and shooting someone straight in the face would probably do it.
Let's jump into the sequel.
We see Laurie going through hell on Earth, even before "Michael" come back into town. It could be argued that it's just PTSD but I feel like that doesn't explain everything, especially the more "supernatural" aspects of this movie. This entry has way more hints at the chance that she suffers from PTSD.
One of the many things is Michael and Laurie sharing the same daydreams/visions/hallucinations. How can Laurie see young Michael Myers? How can she see her dead mom? Why is it whenever Michael Myers eats something or kills someone Laurie reacts to it? That seems more supernatural than realistic and something based on reality, doesn't it? Especially someone she doesn't know. I don't think PTSD causes someone to feel what someone else is doing. Neither does D.I.D., but when you have two or more personalities you don't realize what's going on and you could have little tidbits of memory relapses that you don't recall because technically it wasn't you, it was the other you.
Another example, maybe the biggest, was from a deleted scene. The scene where Laurie is in therapy and her therapist tells her about the folklore about the Native American and wolves. She explains how there are two wolves, the good one and the bad one. She explains that these two entities in everyone, even her. She also explains how these "wolves" are constantly fighting each other, kind of like how people with D.I.D. constantly struggle with one personality wanting to be more dominant than the other. So that was a pretty obvious hint at duality, two persons, two souls, two personalities, etc.
The therapist also says this one line that really stuck, "the wolf that wins, is the wolf you feed." So essentially, the more bad stuff you do, the more the bad side (in this case personality) becomes more dominant. We see Laurie high a lot through the movie and drunk/drinking alcohol. Substance abuse can't cause these disorders, but they don't help either.
Throughout the entire movie (and in a couple of deleted scenes) we see Laurie daydreaming/hallucinating about Michael killing her or her being dead. This could symbolize the death of the old, good Laurie, which correlates to what her therapist said about one or the other wolf trying to essentially become alpha. The bad personality is trying to take over. Also take note that the closer Michael gets to Haddenfield, the more violent and out of control Laurie gets. I don't need to expand upon that.
Laurie experiences terrible seizures, which can happen when you suffer from D.I.D. Laurie constantly snaps at people throughout the film. She can go from nice and easy going to harsh and aggressive in less than 30 seconds. People with D.I.D. do this very often as well when they transition from Personality A to personality B, C, D, etc.
So where does this leave Michael? Well, if you haven't guessed by now... he doesn't exist anymore, he died in the remake. Which begs the question, "then who killed the farmers, the strippers, the cop, etc". That's also easy, nobody. I feel like Rob Zombie knew that many horror fans wouldn't appreciate a Halloween film with minimal violence and psychological overtones, because you know, god forbid a horror fan uses their brain. Those deaths are just there to serve the gore hounds and the fans who want to see someone get offed. Or they could also just be another hallucination by Laurie.
Yes, Laurie killed everyone.
I know it's weird and unusual, but look at it. REALLY LOOK at the movie, pay attention to the dialogue, look at the set pieces, the music, the editing, the cinematography. You'll eventually see what I see. I could go on and on, but I think I said enough. If you have any questions or want me to explain something or whatever, just tell me and I will.
"You're entitled to your wrong opinion. That's fine."