Insurance killed the 2-door muscle cars of the late 1960s and early 1970s.
I can only imagine what this latest generation of large-displacement Mustang/Camaro/Challenger will do to raise the eyebrows of the insurance folks...
I agree that the extra doors are probably Detroit's insurance alibi when stuffing big V8s in the recent Marauder, Charger, 300C, Malibu SS, Impala SS, Trailblazer SS, and this leftover Holden/G8 thingy.
Nobody's gonna wrap a 4-door around a tree or bridge abutment at high speed, they have children on board!