Early on in my career I read about some medical device software and decided that this was not something I wanted to be involved with. The idea of worrying that something I wrote could potentially kill people is not a pleasant one.
I write medical software every day that is very close to patients. When I see our software (or maybe software I know the intricate workings of) helping doctors save patients, I am happy.
When stuff like what's in this article happens, it is quite disappointing. Luckily none of the projects I've worked on have come close to endangering patients.