If we're talking about propaganda, reading Galula is useful, from page 14 (also on my blog):
Propaganda -- A One Sided-Weapon
The asymmetrical situation has important effects on propaganda. The insurgent, having no responsibility, is free to use every trick; if necessary, he can lie, cheat, exaggerate. He is not obliged to prove; he is judged by what he promises, not by what he does. Consequently, propaganda is a powerful weapon for him. With no positive policy but with good propaganda, the insurgent may still win.
The counterinsurgent is tied to his responsibilities and to his past, and for him, facts speak louder than words. He is judged on what he does, not on what he says. if he lies, cheats, exaggerates, and does not prove, he may achieve some temporary successes, but at the price of being discredited for good. And he cannot cheat much unless his political structures are monolithic, for the legitimate opposition in his own camp would soon disclose his every psychological maneuver. For him, propaganda can be no more than a secondary weapon, valuable only if intended to inform and not to fool. A counterinsurgent can seldom cover bad or nonexistent policy with propaganda.