Did somebody call an expert ?

Experts. Are they really all they are cracked up to be ? Last night I was watching a well known T.V presenter swimming in the U.K sea with sharks.  It all looked a bit nerve wrecking and the sound track of the TV program played up to this... but the fact that these sharks were feeding on a dead whale set my alarm bells ringing. The presenter assured us that the whale was a lot tastier than a rubbery suited diver, so all would be well. Well rather them than me I thought.
   Well what could possibly go wrong next ? Any guesses ? The resident shark expert was quite happy to allow the diving to continue. Of course it wasn't long before the sharks were bumping into the divers to see what whether they were suitable food. All of a sudden the mood changed and one diver was slightly bitten and the panic set in. Well. well, I didn't see that coming....
  Now im no shark expert of course, but if I could predict this event was heading south then why didn't the expert see this ? I am starting to develop a lack of faith in anyone proclaiming to be an expert in any field. I think its important to eye up and make a final decision ourselves in any situation. Trust only you.
 I have come across various other anecdotes about experts who have failed in their particular field especially when their skills are called upon in their personal lives.
   I know of a builder who built a garage wall for himself that fell down next day, a swimmer who swam for our county who hardly dare swim across a small strip of water to an island. She froze for ages as everyone else ( family ) just swam across casually. I watched on from the lake shore totally baffled and wondering whether said girl could even swim ! Doesn't add up at all does it ?
   A particularly interesting story occurred locally to me. The TV survival expert Bear Griff  went down a cave that is well known for flooding. On the day of filming the rain was torrential. What could possibly go wrong ? The cave rescue people had to come out to save him as " water levels suddenly caused concern " Unbelievably no one not even Griff was wearing any helmets ! Where was the expert attitude ? We all have off days but some of the above examples show a very worrying lack of basic common sense. And here lies the problem.