He felt sorry for them and their limited reality.
..of people who have lived chained to the wall of a cave all of their lives, facing a blank wall, and some people who got away and left the cave, walked outside into the sunshine and discovered what it's like outside the cave. Some of these people shared what they found when they stepped outside their comfort zone. Their own journey to discovery. The lessons they had to learn the hard way. Their trials and tribulations.
We all have the capacity to learn. But not everyone has the desire to learn.
The process of progressing out of the cave is about getting educated and it is a difficult process. If you want to leave the cave, you need to question your beliefs. When getting an education, there is a struggle involved. We want to resist because knowing the truth can be a painful experience, to a point that it's easier to be ignorant. It takes courage to step outside your comfort zone and think different than before. Not everyone will understand and be happy for you. Just like how the other prisoners responded to prisoner Z's return, you can expect friends and family to laugh and ridicule you. It's normal to face criticism once you leave the cave.
We all start in that cave. But we don't have to stay there. Perhaps on that day, a glimmer of light punched a hole in your most basic assumptions. Will you break free to struggle towards the light even if it costs you your friends and family? Or will you stick with comfortable familiar illusions?
Remember, it's not enough to leave the cave. It's more important to stay outside of the cave.