As with all accidents, this one will prove to be composed of a chain of events which at any stage could have been broken and the accident prevented.
Even if it turns out to be finger trouble on the part of an inexperienced pilot, the chain could have been broken by better supervision, organisation, training, liaison - at any stage, all it would have taken was one person to say 'no that is a crap idea, why don't we do it another way/at a different time/etc'
It is too easy to blame the pilot and ignore all the other people/factors that put him in the position.