Nuclear proliferator

we should think USA as the basic cause for Nuclear proliferation.Had not the US supplied fund and material to Pakistan, that country could have not been able to proliferate.So indirectly It is the US funds which helps proliferation. Now Zardari is asking further funds to do more proliferation and us will surely grant it.The us sheds crocodile tears in the UN general assembly. Why can't the US refuse funds to Pakistan as charity?