The important point I am trying to make is that ALL pilots Err, and there is nothing shameful about it. If you think any human system will simply not err, you are mistaken (like that circular logic??)
It is no slur to have had a human error accident, any more than a baseball hero must make 100% hits while at bat. It is impossible for a human system to be infallible. To get the errors down in percentage, we must make the job easier and more predictable, and less reliant on extra-human capabilities. For that Chinook crew's family to hang their heads because an expert group had decided that they erred is not a shame on them, it is simply a fact that they undertook an enterprise that had slim margins, and that less than perfect behavior could cause a mishap. Since none of us can behave that way, a certain number of mishaps will occur. Remember, the military are those among us who decide how many lives a hill is worth.
It is clear from the posts on this thread that this concept is not understood, perhaps because I cannot adequately explain it.