This is a Capt Hindsight discussion .
For those who knew Andreas Lubitz , he was a very very clever , motivated kid with above average abilities as a pilot. He managed to hide his disease, and convinced a lot of people that stress was the reason he discontinued his training. He then managed to convince someone to be given a second chance, as as we understood, his " above average pilot abilities " were the decisive factor. I do not think the person(s) that gave him that second chance had the possibility to have a look at his medical file. That was, again as we understood it, until the accident a medical secret.
A lot of people sleep badly today because of this, but with hindsight, only with hindsight.