Don't forget the end of the article...
"They argue that if the Lord of All Ages is to appear when the world is full of oppression and tyranny, then we ought to help spread evil, tyranny and oppression in order to facilitate the coming of the 12th Imam, Mehdi."
The serpent already exists among us.
I wonder if the Iranian leaders recognize that anything they do is tyrannical or oppressive, so trying to spread it would kinda be contradictory to their supposed beliefs.
Bottom line, while it's good to try to understand what motivates others, even if it's way off of the wall, nuttier than a fruitcake, gonzo bonkers, it's far more important to stake your response to them to what they do.