Notice that the officers that abandoned the Oceanos were prosecuted.
But the crew did help the passengers. we have testimony from the passengers and evidence from the wreck.
Not all the crew are assigned to life rafts or lifeboats.
Engineering staff will have their own assignments.
Once it is obvious that the ship is on it's side and sunk, what were they supposed to do? sing Rule Britannia as they went down with it while saluting?
It is also possible that they were assigned as members of crew to man life rafts, there is supposed to be at least one crew member for each raft.
That they had immersion suits and documents is not surprising. they were trained and experienced seamen. They would have known what to do and if they were sensible had 'grab bags' with their valuables ready to go.
I know when I have been offshore skippering a yacht all my documents were in a waterproof bag ready to go as were those of anyone else with any sense. This is even more important in a storm.
Also for the immersion suit, it would surprise you how fast I can put one on.
As a skipper my grab bag had passport, wallet, credit card, mobile phone, handheld VHF, batteries, sachets of water, flares, handheld GPS, energy bars, chocolate, compass, knife, hand power torch, fishing line and hooks, watermaker, inflatable radar reflector, foil blankets, a pack of waterproof cards and a floating knife.
Not all needed for coastal sailing though.