Don't blame accountants. They don't make any decisions, and they don't have the technical expertise to know what is dangerous.
The CEO is a good start. I bet the COO and head of engineering are also at fault. People signed off on these planes without doing the required installation of the door. If it's a systemic issue, the quality control team is to blame.
Aviation is a regulated industry, right? I expect the FAA to get to the bottom, if not lawsuits.