Roulis, the rarity of such a terrible event shows how strictly the engine-starting routines are for air carriers.
Millions of departures over decades, and only a few such serious occurrences. Likely it is not as simple as a just matter of "respect for Mekaniks [sic] and ground Crews".
Let us be patient, for we do not yet know the circumstances surrounding this particular accident yet and how a routine engine start ended so tragically.