OR for fucks sake, while this is a tragic disaster, events like this are so incredibly rare, that we should be cautious to avoid 9/11 style psychosis.
We should have avoided that psychosis in the first place by not locking the cabin doors. If they had locked cabin doors on september 11, they would have opened them as per the then standing instructions on hijacks and even flight 93 would have ended inside a skyscraper or the Pentagon.
Even in 9/11 the cabin wasn't rushed with grenades and explosives, but with box knifes. Suppose it happens again? How long do the pilots hold out when the hijackers slaughter the passengers one by one outside their door, on their camera? And that assumes the passengers will happily play along - how many hijackings have occurred since 9/11 where the passengers sat idly by, waiting for their fate to be sealed? I bet it's a binary number.
And another thing: now the pilots are in control of all those people. Quite literally untouchable. If you have even the smallest inclination towards a Messiah complex, this will set it right off. Couple that with the enormous pressure on pilots who are in debt, with airlines in trouble and sacking pilots, and you have a recipe for disaster.
The cabin door lock was not meant to protect the passengers, it's meant to protect the skyscraper. I say we should get rid of it.