IIRC some of the underlying bugs came about because they used a much less dangerous device (X-Ray only) as the base and added the more dangerous system on top.

IIRC some of the underlying bugs came about because they used a much less dangerous device (X-Ray only) as the base and added the more dangerous system on top. The reused software components had different units of measure than the new mode which wasn't exposed until things were in "unexpected" error states. Then there was the usual arrogant gas lighting of anyone who reported the machine injuring and killing people. So the standard mix of computers are infallible and everyone in the change covering their asses by covering their ears and eyes so that the machine could kill again and again.