Allah Never Destroys the Good Nations:
But why were there not among the generations before you those possessing understanding, who should have forbidden the making of mischief in the earth, except a few of those whom We delivered from among them? And those who were unjust went after what they are made to enjoy of plenty, and they were guilty. Your Lord never annihilates any community unjustly, while its people are righteous. (Al_Quraan_011.116-117)
Allah Never Changes the Conditions of a Nation till their People (NOT their Leader) Changes themselves:
In the manner of the people of Pharaoh and those before them; they disbelieved in Allah's communications, therefore Allah destroyed them on account of their faults; surely Allah is strong, severe in requiting (evil). This is because Allah has never changed a favor which He has conferred upon a people until they change their own condition; and because Allah is Hearing, Knowing. (Al_Quraan_008.052-053)
