I am perfectly aware of the risks -thank you!
I was commenting on the Blue Hole as a dive site. I do not presume to recommend that anyone including inexperience divers do that dive - I'm sure these people can make their own minds up on what they want to do based upon advice from their qualified dive masters.
AJ - re your last comment Hol chan is a cut through the reef and is only 30 feet deep and Shark Ray Alley is inside the reef and about 10 feet deep so these are best snorkelled in my view, other than for the night dive. For scuba you will go outside the reef and there are lots and lots of dive sites close to AC so there is no real need to do a day trip to the atolls if you are excluding the Blue Hole, except it is a fun day out.