Equally, you've not earned the right to worry about their PSTD issues until you realise just what happened- the flight crew pulled off something just about unprecdented in the annals of flying history. Landing a pod-slung jetliner in a river? A miracle, IMO.
That is irrational thinking, the OP said 'they should be happy to be alive.'
They can still suffer terrible after effects, whilst understanding that the crew did a great job under the circumstances.
Once again, I am restricting my comments to these few words from the OP and am not expressing an opinion on the rights or wrongs of any litigation.