If Surak's peace and serenity-through-logic was motivated by a desire to avoid war, then the psychic resonator was just another weapon that needed to be defeated through pacifism. I'm not seeing the problem with this scenario; the resonator was defeated by the new Vulcan peace movement in the same way nuclear weapons were - the motive to use them was removed.
I doubt the wholesale reformation of a society was motivated by the desire to disable just one
weapon. I can believe it would be due to the desire to disable all