Keep in mind, it's not just that the power is getting cut, it's getting cut because the key is getting bumped or otherwise turned to the off position. Of course

Keep in mind, it's not just that the power is getting cut, it's getting cut because the key is getting bumped or otherwise turned to the off position. Of course, there are generally 2 different off positions, and in one of them (the really off position), the steering wheel also locks. So yeah, losing power steering, power brakes, the ability to accelerate, and possibly even having the steering wheel locked up, all while the car is in gear, can make it impossible to avoid collisions. Combine that with the fact that it is a completely sudden surprise to both the driver and anyone else around the car, and to top it off, the airbags are disabled. It's generally an extremely dangerous situation.