a diving instructor who went by the book, gave you all the warnings, told you what to expect and how to respond in an emergency and what to look out for,

or

One who simply told you, the book is ok, but don’t worry about it, just gear up, jump in and have fun. Everything always turns out alright?

anyone who would be so foolish as to think that they can ‘find their way’ with out the instruction book is more foolish than one who just denies the whole thing outright.