She often caused controversy because of her strong anti-Buddhist, pro-Catholic ideology. When she heard that Diem was to sign a statement offering compensation to the families of Buddhist protestors shot by the police of his brother
Ngo Dinh Can, Madame Nhu was reported to have thrown a bowl of soup at him. Notably she mocked the protest by
Thích Quảng Đức, who performed a
self-immolation in a crowded
Saigon street in response to the shooting of Buddhists by Diem's regime. Madame Nhu called it a "barbecue" and stating "let them burn and we shall clap our hands". Her parents disowned her because of her role in the persecution of Buddhists, with her father resigning as ambassador to the United States and criticising her brother-in-law's regime. This occurred after special forces loyal to Nhu raided the
Xa Loi Pagoda in Saigon in August. The pagoda was vandalised, monks beaten, the cremated remains of
Thích Quảng Đức, which included a heart which had not disintegrated, were confiscated. Simultaneous raids were carried out across the country, with the
Tu Dam Pagoda in
Huế being looted, the statue of
Gautama Buddha demolished, and a body of a deceased monk stolen. When the populace came to the defence of the monks, the resulting clashes saw 30 civilians killed and 200 wounded. Through her paramilitary organisation, Madame Nhu claimed that the Buddhists were "controlled by communism" and that they were manipulated by the Americans, calling on Diem to "expel all foreign agitators whether they wear monks' robes of not". When
William Trueheart warned that aid might be withheld if the repression orchestrated by the Nhus continued, Madame Nhu denounced it as "blackmail". Nhu and Diem, fearing a cut in aid, sent Madame Nhu to the United States on a speaking tour. She denounced American liberals as "worse than communists" and Buddhists as "hooligans in robes". Her father did not share the same beliefs and followed her around the country, denouncing the "injustice and oppression" and stating that his daughter had "become unwittingly the greatest asset to the communists." Madame Nhu also defiantly predicted that Buddhism would become extinct in Vietnam.
In the wake of the tumultuous events, Madame Nhu appeared on NBC-TV's "Meet the Press" on
13 October 1963, defending her actions and those of the South Vietnamese government. "I don't know why you Americans dislike us," she said. "Is it because the world is under a spell called liberalism? Your own public, here in America, is not as anti-Communistic as ours is in Vietnam. Americans talk about my husband and I leaving our native land permanently. Why should we do this? Where would we go? To say that 70 percent of my country's population is Buddhistic is absolutely true. My father, who was our Ambassador to the United States until two months ago, has been against me since my childhood."