Many nations do not wish to go against the nations that sponsor international terrorism because in preempting such actions they make themselves and their citizenry a target of the very international terrorism groups that they are trying to stop. In fact remaining neutral on the issue of international terrorism is the safest thing for nation to do for its people in the short term.
However in the long-term and considering the future of our own children it makes no sense of all not to take action prior to international terrorism groups obtaining nuclear weapons from the nation states, which may give them or sponsor them.
However, such a policy is necessary in the nuclear age. Today we find United Nations and the Security Council completely ineffective and ineffectual in the war on terror and in their ability to sanction the Iranian leadership from manufacturing atomic bombs and nuclear weapons. Additionally, with Iran threatening to;