Okay look. If you know their TRAUMA BUTTON from their memories before Sabra, that helps them remember. It's a dick move.
I know you could do it provided you actually KNEW people well enough to know their most disturbing memories.
That's probably a temporary measure though.
So we need...what? To make them not crazy and keep people from being crazy. They're keeping people from the lake. If the crazy is in our other water supply we may as well be crazy cuz that's better than dehydrating to death.
...if it's in the water though it'll get into the food and medicine that grows by the lake.