Bhutto or any Pakistani Prime Minister since General Ayub Khan took power in the early 60s had to give deference to the Army on issues like Kashmir,Nuclear weapons,relations with China among others.Bhutto had to sing these tunes,whether she wanted to or not.
“The current world view of Mrs. Benazir Bhutto’s Islamabad is a direct continuation of the vision of her father — Zulfiqar Ali Bhutto. The political vision of Mr. Bhutto was crystallized as a historical legacy of the 1971 dismemberment of Pakistan. The new Pakistan must base its policy on Islamic character and look westwards — to the Hub of Islam — for identity and belonging. He considered Central Asia an extension of the non-Arab Muslim World that Pakistan would bring with it to the Hub in order to expand its non-Arab component. The active support for the armed liberation struggle in Kashmir was defined by Mr. Bhutto as a major way of proving and demonstrating Pakistan’s commitment to Islamic solidarity and values. Extremely close strategic relations with the PRC, including Beijing’s strategic guarantees and assistance in the development of Pakistan’s nuclear weapons, were considered the foundations of Islamabad’s ability to deter an inevitable clash with the US and a possible war with India. Mr. Bhutto stressed that the US is inherently hostile to Islam because it refused to accept the drastic changes in world order advocated by the Muslims. Indeed, Mr. Bhutto’s military nuclear effort was motivated as much by the determination to deliver the Islamic Bomb that would make Pakistan a Muslim World leader, as by the need to counter-balance India’s military nuclear program. The validity of these principles has been stressed repeatedly by Mrs. Benazir Bhutto as of the fall of 1993.”
For the rest see Bodansky’s essay: Pakistan’s Nuclear Brinkmanship; as well as his book, Bin Laden: The Man Who Declared War on the United States