But Tyuule didn't have a life left after she got captured. She didn't destroy her life in this case. She made use of it, and I'd say she used it well.

I'm guessing you don't know many vindictive people. Revenge feels really good, especially if it's served cold.

The emptiness afterwards isn't necessarily a bad thing. It's just like any other goal in life. Once you get it, it will leave a gap inside you. Then you simply move on to the next thing.