Ever hear of the Hojatieh (Ahmadinejad is a follower/member)? How about their belief in the destruction of over 1/3 the earth's population to pave the was for the Mahdi.
From Wikipedia on their Doctrine - "The Hojjatieh society has been described as "an underground messianic sect ... which hopes to quicken the coming of the apocalypse" in order to hasten the return of the Mahdi, the prophesied future redeemer of Islam"
Ahmadinejad 2005, “O mighty Lord, I pray to you to hasten the emergence of your last repository, the promised one, that perfect and pure human being, the one that will fill this world with justice and peace.”
In 2006, “hasten the reappearance of the Imam of the times and grant to us victory and prosperity. Include us among his followers and martyrs.”
In 2007 “Oh God, hasten the arrival of Imam Al-Mahdi and grant him good health and victory and make us his followers and those who attest to his rightfulness.”