Exactly!
I think it's somewhat human nature to think that doing something wrong is exciting.
Exactly wrong. If doing something wrong were the excitement, ALL guys would violate their vows. Instead, only half do.
When people feel they lack purpose in their lives they find that excitement fills the void.
I think its when people find that their lives lack excitement, where excitement fills the void. Its a subtle difference in what you said, but nonetheless, an important difference.