Perhaps Lubitz, if the accusations are proven true, will have started something that may lead to a better system for all of us - something clearly needed seeing how the lantern-jawed superhuman pilots of old are no longer among us.
That might be true. One problem is that AME's usually are not psychiatrists and then psychiatrists don't know that much about mental illness yet. They work to some ancient medical standards, not up to date with neuroscience.
Apparently sociopaths can be detected with MRI scans. Ask some indirect questions to trigger responsibility and empathy and you will see their brain is dead silent in the part which should show reactions. I bet half of the AME's don't know what a sociopath actually is.