Fear, Confuse, Taunt and Placate are all "soft" controls with limited protection available for any archetype. Those controls, and restricted access to protection from them, exist specifically to create risk, allow NPCs to be more than bowling pins and give purpose to teaming and teammates (Shadow Fall, Clear Mind, Enforced Morale, Antidote, Clarity, Thaw, Vengeance (Leadership pool), Injection (Medicine pool) and Experimental Injection (Experimentation pool) all provide Fear protection).
You can't be immune to everything, all of the time, solo. Not in this game. You can team up with others and be immune to everything, all of the time. That's what makes it an MMORPG.