I had not thought of the rise of microwave terrorism (perhaps with the skin-burning crowd disperser (citation not found) it's already on us).
But my basic tenant is that we / society has an acceptable balance of risk and benefit. Maybe not a rational one but one that is understood by most people. For cars it's pretty high on the risk tolerance. For medical drugs it's really low. For computer hacking it's low too - cf Aaron Schwartz. I would say that medical devices combine low risk tolerance of drugs and low risk tolerance of hacking - making the spectre of hacked implanted devices front page news.
I expect it will be pretty simple to defeat however - only allow networking of a device over near field radio (RFID style). that way there is no remote access in a body, and do a similar thing for any robots or monitors - the only way to connect a surgical robot to the Internet is with a doctors own personal RFID - tcpip convertor, that he takes away with him or is counts back into stores next to the nurses. Massively dropping the risk ratio with a few simple rules.
we can do this - we just need to be sensible about it
Ps
Westminster and canary wharf do have enclosed tube platforms so people cannot jump / be pushed. Because we cannot have bankers or politicians delayed by poverty stricken depressives ...