"After a series of attacks by Muslim militants last month, security forces and allied mobs retaliated by burning down thousands of Rohingya homes in the predominantly Buddhist nation."
---------------
Muslim militants who may have represented a minority in the Muslim community.....instigated a series of attacks.....that so outraged a nation of "normally peaceful" Buddhists......that the Muslims are being driven out of the country. 
-
Whether one feels that the Buddhists responded with over-kill is besides the point. If the Muslims have a complaint, they can take it up with the Muslim militants in their midst.