You seem awfully sure about what you would do but you again do not seem to have considered about what it is like to be fully paralyzed. Let me be clear, I understand the risks of these devices. But my impression is that you're having trouble emphathizing with people with such medical conditions and you're not really considering how it feels to live like that. In fact, you again spend your whole message talking about abstract considerations, but you do not talk about the experience of being unable to do almost anything - how that shapes a persons willingness to take risks and weigh them differently. That is my point about trade-offs, consider the personal and emotional as well as the technical.
Even without malice, my degree used as case studies the failures of the Therac-25 and the digitalisation of the 1992 failure of the London Ambulance Service computerised dispatch system.
I wasn't being "abstract" when I said the frequency with which attacks are attempted can be measured in Herz, that's an actual anecdote from someone I knew a decade ago.
Software safety is an abstract concept. You have experience with specific instances of problems that fall under the abstract concept of software security. This is not to say it is not important.
Not being able to move your hands is not an abstract concept. It can be directly experienced.
