As a grandchild product of 4 holocaust survivors- yeah, they are pretty mentally screwed up. (and it is still vibrating down generations later.)

They usually say the only thing that got them through it is the other survivors, that they weren't alone. In the end, most of them (my grandarents) DID get therapy, much later in life. It doesn't really help. They have enormous survivor's guilt. They prefer not to think about it and live for the present.