But then with the DMT are you conscious or unconscious, and the hallucinations take the form of a dream or nightmare?
With DMT it could go either way, every trip is different. The mindset I have about tripping, is that there is no such thing as a good trip or bad trip, it's just a trip. It is what you make of it. I've had my share of frightening experiences, but I wouldn't really call them bad. As for your state of consciousness, I don't know if I would call it conscious exactly, but you're generally still aware that you are you, but reality as you know it ceases to exist. You just close your eyes, sit back, and explore whatever dimension the DMT decided to drop you into.
Check out PsychedSubstance on Youtube:
https://www.youtube.com/channel/UCn8V3KNSgDr1Dai77_y8JrQ
He has some good videos explaining psychedelics and their effects.
In other words can any Hallucinogen actually make you go Old Man Logan, and wipe out your family because you think they are bunch of Tolkien-esque Orcs?
I've heard some horror stories involving datura. With traditional psychedelics, LSD, mushrooms, mescaline, etc., you are aware that you are tripping. You know what's a hallucination and what isn't. With datura you can't tell. Check out some datura trip reports on Erowid. It's fucking crazy, if there's one drug that is prone to making people freak right the fuck out it's datura.
Oh yeah, depending on dosage it can last for upwards of three days most of which you will not remember. Want to wake up naked in a bowling alley in a city you've never been to? Datura!