Check your sources. Is that story anything more than popular fiction? And even if it is, that's theft and not in the category of a quid-pro-quo trust.
A theft, or stealing, by definition constitutes violating trust. And there is no evidence to suggest that Carl Duckett, the deputy director of CIA, lied to the US Nuclear Regulatory Commission when he disclosed this incident. Here's the incident once again:
In fact, US involvement went deeper than mere silence. At a meeting in 1976 that has only recently become public knowledge, the CIA deputy director Carl Duckett informed a dozen officials from the US Nuclear Regulatory Commission that the agency suspected some of the fissile fuel in Israel's bombs was weapons-grade uranium stolen under America's nose from a processing plant in Pennsylvania.
Not only was an alarming amount of fissile material going missing at the company, Nuclear Materials and Equipment Corporation (Numec), but it had been visited by a veritable who's-who of Israeli intelligence, including Rafael Eitan, described by the firm as an Israeli defence ministry "chemist", but, in fact, a top Mossad operative who went on to head Lakam.
"It was a shock. Everyody was open-mouthed," recalls Victor Gilinsky, who was one of the American nuclear officials briefed by Duckett. "It was one of the most glaring cases of diverted nuclear material but the consequences appeared so awful for the people involved and for the US than nobody really wanted to find out what was going on."
The investigation was shelved and no charges were made.
And even if it is, that's theft and not in the category of a quid-pro-quo trust.
And Israel has also violated the trust in terms of quid-pro-quo by introducing nuclear weapons to Middle East first, something Golda Meir promised Richard Nixon Israel won't do. Pakistan, meanwhile, acted in defence to the presence of nuclear weapons in South Asia which were introduced by India first.
Again, as I stated earlier, Pakistan's military assistance, of what little we did receive was during Cold War and was largely due to our involvement with the U.S., or disengagement from the USSR, depending upon how one sees it. And the equipment we bought from Europe was legal at the time hence there was never any violation of trust. You really don't have an argument. You should correct your bias.