In many ways, the preliminary findings are reassuring with regard to a safety problem with the 787. This seems most likely to be a mass murder suicide, or less likely an accident.
The German Wings pilot flew into a mountain and killed everyone. But when you are learning to fly, you learn very quickly that a crash on take off is usually a fatal event. Whereas crashes on landing, especially in small planes, tend to have lots of damage to the plane, but fewer fatalities. They teach you this, because everyone is so afraid of landing with the ground coming up to meet you. But the take off is more dangerous and you need to respect the take off, be on your game and following your checklists and have a plan if you lose an engine.