I too have been in the water with many many sharks around the world! But if you read what you have posted you have put human qualities to the shark! The shark doesn't know its "Provided by man" they may associate the boats to the food in response, but not the man, the men get in the water when the boat shows up! In a simple brain function I am not sure there would be a indirect connection..... Are they less afraid of a man in the environment? probably, but is it the food or the constant interaction that posses no threat?
When the USS INDIANAPOLIS went down the sharks started out shy, as they do, and became bolder as time went on! That is their natural behavior! I am glade YOU don't want to control shark feeding, but too many want to control every aspect of our lives! I just cation people not to over react! It looks like the guy died from an embolism and as always panic killed him not the shark!
My contention is that the shark follows a behavior pattern and it is driven by instinct and not by mans actions! If it were they would be so many caught and killed, because they would have learned to stay away from nets etc! But they are creatures of habit and opportunity! We use that opportunity to get closer under safer conditions to a wild animal!
We just need to understand that people will use our own words against us pointing the finger of blame! We need to take responsibility for or own actions!