Restore memories? We'd need some way to store them first, and extract them, and even identify wanted ones. It's not like people just forget. It's...

Do you know what a whiteboard is? With markers? You write on it, and then you erase it when you want to write again. We're all whiteboards. When the things are erased, we're still what we were, but it's gone. We're pretty sure just wouldn't have memories to be restored.