You're rather foul mouthed and small brained aren't you?
If you want to apply the gentlemen's statements to the thread, A nuclear Iran means a nuclear arms race in the region from countries that are neither friendly to or trustful of Iran.That means an increased chance for radical elements of any of these countries to get their hands on nuclear material. for whatever ends they might desire, this includes the kurds, the palestinian radicals, Israeli radicals, what have you.
It leads to Iran being more brazen or bold in its support of anti-Israel groups and in attempts to bend post war Iraq to its will, both of which are proven facts.
It leads to a greater chance that Israel will indeed declare its nuclear weapons capability (if such exists), and thus raising its own alert level to hair trigger proportions because of its size and vulnerability to a first strike.
Saddam believed the US wouldn't invade Iraq. The consequences of misplaced perceptions in a region already known as a tinderbox and not being very secure will be raised to the maximum.