Why Didn't Anybody Ever Make a '60s-'70s Exploitation Flick Role-Playing Game

For all I know they have since I haven't paid attention to that shit in fifteen years. This occurred to me while watching THE PSYCHEDELIC PRIEST where the titular priest and a quail hitchhiker are happily tooling along the highway when by the side of the road is a pregnant woman who is about to give birth. So naturally being Good people they have to drive to the nearest commune where luckily one of the dirty drop-out hippies happens to be a doctor. I was like, "Man, that is a lame plot contrivance straight from the undertaxed mind of an inept Dungeon Master who is making it up as he goes along." But think about it. You have the same rigidly defined character classes, the same improbable motivations for going on adventures that make no sense, the same thirst for loot and magic potions. My guess is that this was all probably a little too close to reality for Gygax & co. circa '73 so they just dropped some Tolkien novels in the stew. Anyway, I made this new character who is a chaotic-neutral Biker with a +2 chain.