I don't 100% understand your question. If it is to me personally, I don't believe it is wise to feed sharks and put tourists in the water with them period. Professionals doing it for research I understand. But I'm of the opinion that it should not be allowed beyond that context.
What my comment was referring to is that IF this was NOT a feeding operation but simply a snorkeling tour, I am questioning the wisdom of dropping snorkelers on a site that is know to be used for shark feeding. Whether that feeding is done on scuba or snorkeling is irrelevant. Now if this was a shark feeding operation and the snorkelers knowingly signed on for that experience, than the risk was known and willingly assumed by the snorkelers.