"The reason Syria, Iran, and Lybia might attempt to build nuclear weapons in secret would be the same as Israel's reason for building nuclear weapons in secret. "

Except that Syria, Iran , and Lybia were signatories to the NPT, which prhibited such programns in return for aid in peaceful nuclear development.

Israel developed it's nuclear weapons BEFORE the NPT, and IF a signoatory woiuld have to be at the level of the US, Russia, France, China, and Britain.