LH,

"They ARE allowed by the NPT to enrich Uranium to the point where it can be used to fuel their nuclear reactor and make electricity."

This IS true, but you have ignored the rest of it - UNDER inspection by the UN to insure that it is ONLY to power production level, and not weapons grade. IRAN HAS VIOLATED THIS BY KICKING OUT THE INSPECTORS AND THE MONITORING INSTRUMENTS.

"So...a nation which is not violating its NPT obligations is being accused by the USA (and various others) as if it was violating its treaty obligations." IS A FALSE, MISLEADING STATEMENT.

Iran IS violating its NPT obligations.

Regardless of what you might want to believe. THAT is why the UN is acting.