It was amusing to see Alecto try to hide how frightened she was. Holding the power of another's life entirely in her hand was an intoxicating feeling that Hermione didn't think she would ever grow tired of. She became a Death Eater because she was tired of feeling weak, tired of feeling like she had to rely on others to keep her safe. Knowing that she was going to kill another, especially one that had brought such misery to her in life, made her feel empowered. No longer was she the trembling girl in the broom cupboard.