Claims regarding Iran’s innocence in relation to global terrorism are fallacious. The state supports Hezbollah and Hamas and is itself an immense kleptocracy — http://www.reuters.com/investigates/iran/#article/part1 .
As regards Sunni-based terrorism, a fair look-up of “Zawahiri, Russia” should straighten that out. In the wake of the Soviet defeat in the 1980s, the criminals appear to have picked up on the CIA/ISI method of producing a treasury-draining proxy (Charlie Wilson’s Taliban) and throwing it back at the west.
The Kingdom has invested heavily in western success (via Kingdom Holdings) and has embarked on cultural updating sufficient to produce an iconic set of accomplished women — https://conflict-backchannels.com/2016/11/02/sixteen-women-the-kingdoms-most-powerful/ . However, sigh, in the medieval worldview, the legitimacy of kingdoms rest on the persuasive power of clerics.
My trope for all dictatorships: “Different Talks — Same Walk!”
They all produce leaders who look good on the outside — well, maybe Qadaffi’s a stretch on that — but turn out irredeemably ugly on the inside. I call them “MaligNarcs”, short for “Malignant Narcissists”.
The greater east-west framework: feudal methods, medieval worldview v modern democratic rule of law and the constraint of power by representative means. On that, the House of Saud has a long history with “the English” and may be expected to lean westward with time. The same may not be said today of Moscow / Moscow-Tehran and all the related phantoms of the Soviet Era.