This has been alluded to in other threads or forums. Personally the initial mention of a down current did not bother me much. I have never experienced one but my exposure to all sites throughout the year is never going to be close to that of the Cozumel dive community.
Perhaps Cozumel dive ops should document what down currents have been experienced (if any) with enough details to make it a well understood condition. That along with recommended actions if one is encountered removes this as a concern
Since this has apparently impacted the view of Cozumel as a dive destination...and there is no hiding the apparent fact that they engaged in a high risk dive and lost, then one or more of the dive shop folks need to release their dive computer data showing depth as a function of time. Present the data, discuss what happened in a factual manner, then get on with their lives.
Doing this should minimize any adverse publicity for Cozumel and may prevent other divers from a similar or worse fate in the future.