There are principles Ahlus Sunnah Wal-Jamaa-ah apply in dealing with the rulers. These fundamental principles can be considered an overall rebuttal against all the doubts brought forth. So whoever masters these principles and clings to them, then indeed the truth will become manifest and many of the doubts will cease to exist in him.
http://salaficentre.com/2011/09/argu...j-and-takfeer/