In the story the author's message is to be careful for what you wish for. The reason why I he choose this is because echels wanted amazing, and also wanted something that was hard and challenging and that’s what he got. Eckels couldn’t handle this because it was to challenging so he went to the machine and messed everything up because he couldn’t handle what he wished for.
(Eckels, not looking back, walked blindly to the edge of the Path, his gun limp in his arms, stepped off the Path, and walked, not knowing it, in the jungle. His feet sank into the green moss. His legs moved him, and he felt alone and remote from the events behind.)