It is the fault of the people threatening violence against moviegoers.
edit: I'm not commenting on the overly litigious culture of the US or easily panicked mentality over any threat. Those are fair critiques of the US. However, both of those would be moot if it were not for a credible threat of violence from some person/group. This philosophy of culpability pre-dates the US legal system.
Did you know that if you graduate from med school in Canada, they advise you not to step forward if you're on a US flight and someone asks if there's a doctor on the plane?
Because you'll get sued.
"The Aviation Medical Assistance Act of 1998 ensures that if you're flying in the United States, even if the airline is not owned by a U.S. company, you have Good Samaritan protection."[1]
I also found one article interviewing a doctor who answered the call who mentioned that no physician has been successfully sued for assisting in an inflight medical emergency.[2] A claim that he actually backs up with a citation.[3]
[1] http://www.aafp.org/fpm/2008/0400/p37.html
[2] http://www.cockeyed.com/personal/doctor_airplane/doctor_airp...
The US needs a more sane legal system and the world needs an appreciation of higher quality software systems, made more slowly and carefully.
EDIT: "made more slowly and carefully" is more specific and simplified than I needed there, feel free to ignore it...
They're taking orders from terrorists, and it's a calculated decision.
If I say it's their fault for getting hacked for making the movie, that is victim blaming. This is just disappointment.