Katniss Everdeen killed President Alma Coin for two primary reasons:
- Revenge for Prim’s death: Katniss came to believe that Coin, not President Snow, was responsible for the double bombing that killed her younger sister, Primrose.
- Preventing a new dictatorship: Katniss saw Coin as a potential new tyrant, mirroring Snow’s ruthlessness and willingness to sacrifice innocent lives for her political ambitions, as evidenced by Coin’s suggestion of a final Hunger Games involving Capitol children.
Did Katniss want to kill herself after killing Coin?
He knew she had a plan. Durán Rafaela she didn’t know she was going to kill herself until after she’d killed coin. Realized she couldn’t force the people she loved to see her tortured and broken. So she’d end it.
Did Coin kill Prim on purpose?
From my experience, Katniss speculates that Coin deliberately sent Prim to die in the Capitol bombing in order to fully gain her trust, but it’s never outright confirmed or denied.