At the time, programmers could be divided into "corporate" types and "computer nerds", people like the ones who founded Apple or the various software firms of today. Software wasn't an industry, it was a function within companies that did other things. You needed software to do useful things with computers and even to boot them up, so you had someone write it.
Not knowing the identity of the person who wrote this code is NBD. He likely never even knew there was a bug or problem, and if he did he couldn't be held responsible in any way, nor could the managers of the time.
If anyone should be held responsible, it would be the FDA for not getting ahead of the technology curve at the time and regulating computerized devices better than they did sooner than they did.