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  • It's a measurement on an arbitrary scale. Nothing I've said is news to anyone who designs safety critical systems. I'm certainly not saying that safety isn't important or that we can't assess it. What I'm saying is that placing a number on that assessment will always stray into the realm of politics in a way that physics and mathematics never does. It lulls ignorant people into the belief that something is safe or not safe. They feel safe because they've been told it is safe or vice versa. Physics doesn't care if you feel safe.

    It's notable that contemporary safety standards such as ISO 26262 generally avoid numerical assessments, for the reasons outlined above.

  • Safety cannot be measured because it's a feeling. One person feels safe climbing a mountain without a rope and the next person is petrified. Safety is just word to describe a concept. It's different to the wavelength of light or force or charge. These things are based on fundamental properties of the universe that can be measured and are repeatable.

    A reasonable approximation might be to consider the likelihood of an adverse event given a use case over time. We could say that an accident every million hours is our definition of safe but that is completely arbitrary in the way that the physical laws and constants are not.

  • It's all part of the NHS War On Mental Health. The plan is remove treatments that conservatives don't believe in because they can't see them. They will take those savings and use them to extend the lives of terminally ill people in persistent vegetative states because life is sacred and needs to be protracted and painful.