Well. Because Iraq is full of uneducated terrorists, they will never be on the security council. The risk of them blowing everyone up with a home made explosive are too high.
Iraq
Since most nations of the world are in the United Nations, all of the countries fighting in Iraq and UN member states. The US has in the past used Iraq's material breach of United Nations Security Council Resolutions 1441 and 687 to justify the invasion of Iraq. Despite United Nations Security Council Resolution 1483 later recognizing US/UK jurisdiction over Iraq as legal, the invasion was never supported by a Security Council resolution.
There were allegations that Iraq had weapons of mass destruction and considering that Iraq famously used weapons of mass destruction during the Iran-Iraq War, such an allegation was not preposterous.
The UN doesn't do much anymore after the result of their structure in the Security Council and their poor reactions to events in Iraq
Revolutionary Command Council - Iraq - ended in 2003.
Revolutionary Command Council - Iraq - was created in 1968.
Islamic Supreme Council of Iraq was created in 1982.
National Security Council
How does the security council keep peace?
The Security Council has elected and permanent members.
Security Council of Russia was created in 1992.
The U.N. Security Council has 15 members.