The facilities to process uranium from natural ore to weapons-grade need to be huge to make any quantity of 90%+ enriched U-235. For a power plant, all you need is 3 to 5% U-235.
Plutonium is much easier to obtain, being made in nuclear reactors themselves, and Pakistan has mastered Pu-based weapons. Thus, Uranium is useful only for power, not bombs. In fact, enriching Uranium to bomb-grade doesn't serve much purpose beyond tempting people, because a uranium bomb is much easier to make than a Pu bomb.