You're missing my point. I'm not assigning moral culpability? responsibility? for the death, but thinking about the upshot of failing to unlock the door. The inability to open a locked door to or in a burning building, however it came to be locked, can lead to people dying that wouldn't have otherwise died if the door could be unlocked. It's not unreasonable to describe the situation as I couldn't unlock the door, therefore the people inside the burning building died -- there's absolutely a causal relationship there, and it doesn't necessarily follow that I'm therefore culpable for or responsible for the deaths.