I would imagine for the same reason why your wheel nuts are not left-threaded.Why aren't these bolts left threaded? Sloppy engineering.
If you had left hand threaded lug nuts you would have a seventies Dodge.I would imagine for the same reason why your wheel nuts are not left-threaded.
The lefty-loosey righty-tighty convention is reversed for rotating equipment when the nut/screw is on the axis of rotation (think fan clutch, VANOS splined gear)
Wow.On the M62 the crank bolt is called the "Jesus bolt", I had to use a 3/4" breaker bar and a 4 foot cheater pipe.
Double wow.Torque them down like it supposed and its fine. Be lucky that you dont have S38 one bolt goes around 700nm ;D