"When you walk out of the mine, you realize how big the world is. It's nothing more than a bigger cage. But if the bird in the cage is unwilling to even flap its wings, it deserves to spend the rest of its life pecking at the debris."
If he didn't steal, he would be the one who died. Just like those mining slaves, like Ergouzi, like the old mining slaves who were buried alive.
This is the world: steal or die.
He chose to steal.
He wants to live.
Live longer than everyone, live better than everyone.
This is his only way.