Sherpa resentment toward 'luxury climbers' is certainly understandable. In any sport and most human endeavors the glory only goes to the chosen ones, not those who labor in their support. Resentment no doubt exists. But an attack like this is beyond the pale.
3 world-class speed climbers not needing corporate/management company-hired Sherpas pass and anger them. Apparently hoping to molify the situation the three actually helped place the Sherpas' rope for them after the Sherpas got angry and left. It is unclear how the ice dislodged. The lead Sherpa is said to be young and relatively inexperienced. Moro has always had a good relationship with Sherpas, built a school for Sherpas, and has always defended and spoken highly of them.
Whatever led up to it, nothing justifies a gang attack of over 100 Sherpas, some swinging an ice ax, screaming that they are 'going to kill' arguably three of the best high altitude climbers in the world. I understand the three were only saved because a American female climber, knowing the Sherpas would be reluctant to attack a woman, threw herself in front of them.
A full inquiry is certainly warranted.