Du’aa’ to wipe the kuffaar out of existence
Question

                I heard some people saying this du’aa’: “O Allaah, deal with the kuffaar and mushrikeen and Jews; O Allaah, do not leave any one of them alive; O Allaah, wipe them out as You wiped out ‘Aad and Thamood.” What is the ruling on such a du’aa’?.
Praise be to Allah.
    Praying that the kuffaar be wiped out is overstepping the 
    mark in du’aa’, because Allaah has decreed that they should exist and there 
    is a reason for their existence; Allaah does what He wills and rules as He 
    wants. 

    And Allaah is the source of strength; may Allaah send blessing and peace upon our Prophet Muhammad and his family and companions. End quote.