Does it help to put the minds at ease of those whose loss was greatest to be told repeatedly that Captain Collins' decisions were wrong on every count?
No, but putting minds at ease is not the purpose of this discussion.
To have to process the knowledge that your loved father/husband made a clanger that resulted in the deaths of 257 people must be nothing short of agony. To this end, the Collins family have actually been badly served by the likes of Mahon/Holmes/Dunne etc. who have fueled their thirst and quest to "clear his name", which is just not appropriate. And also, I believe, somewhat disrespectful towards the families of the 256 other people who were killed on this flight.