Medecins sans Frontieres in its various manifestations is a respected longterm nongovernmental partner in health in Myanmar.
It has published the results of scientific surveys it has undertaken among people who have recently fled Myanmar.
"These surveys provide epidemiological evidence of high rates of mortality among the Rohingya population due to violence, and suggest that they faced mass killings prior to their arrival in Bangladesh. Additionally, the rates of mortality captured here are likely to be underestimates, as the data does not account for those people who have not yet been able to flee Myanmar, or for families who were killed in their entirety."
Mass killings cannot be denied.