As usual, newjudge has pinned down the point at issue, and argued it superbly, I would award him BA were it a thread I had originated.
As he points out - major disasters arouse major emotions, and with them a very human need to apportion 'blame' so that someone's actions and behaviour can be held accountable, and ideally, that person or persons can be punished, which satisfies the following human need for retribution, and, to use the dreadful Americanism - 'closure'.
But as the cases have repeatedly confirmed, there is actual no criminal intent here - just human error, and as NJ confirms, you can't prosecute and convict someone for getting something wrong, however dire the consequences may be.