Roman Titus Emperor And Law Of Itmam Hujjat
God can punish the ones who deserved through nature: Cyclone, Flood, Earthquake, or by angels, or by human beings. The children of Israel were punished at first by the kind of Babel and then by the Romans. It is not necessary that the punishers must be Muslims or followers of a prophet. What Ghamidi sahib said is that when followers of a Rasool are good enough in numbers, God uses them too to punish the disbelievers.