Where are you getting that dialog? That's not accurate according to http://www.chakoteya.net/NextGen/episodes.htm
(a stone chamber with carved walls)
TALLERA: There. Your reward, as promised.
NARIK: Is it all there?
VEKOR: No, this is less than half of what we were promised. Where's the rest of it?
(Tallera has assembled the resonator)
TALLERA: That is all I could manage. I suggest you take it and leave.
NARIK: I did not come this far to be cheated. I want it all, now.
TALLERA: Very well. You will get what you deserve.
(a strange field wraps Narik then throws him across the chamber. Tallera then sends a second one to do the same to Vekor)
TALLERA: Go ahead, Captain. Pick up the phaser. See what good it will do.
PICARD: You'll never get away with this. Starfleet will never stand and watch you tear apart one of the founding worlds of the Federation.
TALLERA: How little you understand what you're facing, Captain. You're used to fighting enemies like yourself. People on ships with defence shields, energy weapons, warp drives. But this is unlike anything you've ever faced. This is the power of the mind. Pick up the phaser, Captain.
(Riker, Worf and two security guards beam in)
PICARD: Listen to me, all of you! Drop your weapons! Do it! Don't make any aggressive movements. The resonator amplifies violent feelings and emotions. And that's why you wanted me to pick up the phaser. That's how you were able to kill Narik and Vekor. But I can see the symbol on that third artefact, and it is the Vulcan symbol for peace standing between the symbols for war and death. It's a warning that the power of the resonator can be overcome by peace.
TALLERA: You are about to see how wrong you are.
PICARD: Empty your minds of violent thoughts.
(the field passes through Riker without hurting him)
PICARD: Think, Tallera. Two thousand years ago your people were being consumed by war. But when peace came to Vulcan, the resonator became useless. That's why it was dismantled.
(Tallera tries it again on Worf and fails. She sinks to her knees)
PICARD: You were right, Tallera. The resonator cannot be stopped by phasers and shields, but it can be defeated by peace.
(she tries again, but it's a very small field that passes through Picard before he takes the device from her hands)
I read all that as corroborating what I said, that peace was achieved in order
to defeat the resonator. So... we're not getting anywhere. I've highlighted what I see as the key passages that support my perspective.
Moore's opinion that the story did not really fit in well with TOS Surak, and that it just didn't really work period,
Anyhow, lurching back towards being on topic, Gambit,
for all its shortcomings, is certainly better than Descent
in my book.