Actually, many of the extra ways to fail are a direct result of the aerodynamics of rotary-wing flight. Power settling, vortex ring state, loss of tail rotor effectiveness, retreating blade stall, et al, are not available to f/w folks.
And while a neglegent pilot can increase your chances of ending up in one of those situations, factors outside the pilot's control can be causal as well.
There are a lot more moving parts as well: every lifting surface doubles as a control surface and requires constant motion (the angle of attack of each main rotor blade changes continually as it rotates), so any mechanical failure is potentially bad (helos have catastrophic rotor issues far more often than wings fall off airplanes)
I am saying that helos have a LOT of failure points: mechanically, environmentally, and from the nature of the mission. This is the danger inherent in a helo.
And this is all before you get into the capabilities (or lack thereof) of the crew. How's their instrument currency (or even their background... lots of helo pilots are weak on instruments) NVGs? I don't takeoff in the daytime without a set (just in case I'm out late... I'm scared of the dark :-) BUT, if you don't have really good training and practice, they can scare you (or worse, give you a false sense of confidance) NVGs "Don't turn night into day", they work in a different spectrum, which can throw folks.
Harry Reasoner said it best:
The thing is, helicopters are different from planes. An airplane by it's nature wants to fly, and if not interfered with too strongly by unusual events or by a deliberately incompetent pilot, it will fly. A helicopter does not want to fly. It is maintained in the air by a variety of forces and controls working in opposition to each other, and if there is any disturbance in this delicate balance the helicopter stops flying immediately and disastrously. There is no such thing as a gliding helicopter. This is why being a helicopter pilot is so different from being an airplane pilot and why, in general, airplane pilots are open, clear eyed, buoyant extroverts, and helicopter pilots are brooders, introspective anticipators of trouble. They know that if something bad has not happened, it is about to.
Harry Reasoner, February 16, 1971
v/r
Geoff