These doors very effectively mean that control of the plane would be put into the hands of the cabin crew, but magnifies the cost of a rogue operator -- I am certain the risks were evaluated and the challenge of a determined suicidal pilot was ruled outside scope.
And yes, there are emergency override codes, but there are also time override-overrides from within the cabin. Even if the protocol where two members of staff are always in the cabin was broken (or absent), again, that does not stop a rogue operator from despatching with the other person.
The question is (hypothetical at this stage, there are a lot of details still unknown): have these type of doors already saved more lives than the ~150 tragically lost this week?
And yes, there are emergency override codes, but there are also time override-overrides from within the cabin. Even if the protocol where two members of staff are always in the cabin was broken (or absent), again, that does not stop a rogue operator from despatching with the other person.
The question is (hypothetical at this stage, there are a lot of details still unknown): have these type of doors already saved more lives than the ~150 tragically lost this week?