Its similarly difficult to find examples of competent propaganda ; because anything easily labeled propaganda is not competent.
Scientific and logical principles of "evidence" to not apply to human political systems, b/c the method of inquiry are too compromised by the power the system wields over them. Even information about Afghanistan comes through via the government. But today? There is us nothing modern the government wants you to know about.
Maybe some could argue that pre Soviet Afghanistan (in the ‘60) was such a place. But today?