Yep, that vaunted Christian moral superiority

http://en.wikipedia.org/wiki/Ngo_Dinh_Diem

In May, in the central city of Hue^', where Die^.m's elder brother was
the archbishop, Buddhists were prohibited from displaying Buddhist
flags during Vesak celebrations commemorating the birth of Gautama
Buddha when the government cited a regulation prohibiting the display
of non-government flags. A few days later, Catholics were allowed to
fly religious flags at another celebration where the regulation was
not enforced. This led to a protest lead by Thich Tri Quang against
the government, which was suppressed by Die^.m's forces, killing nine
unarmed civilians.