Snow laughs after Katniss killed Coin because he enjoys the irony of the situation. He avoided the official execution ceremony, even though Panem's citizens still take their revenge on him, while Katniss ends up snatching away the victory and power that Coin thinks she has successfully secured.
By killing President Coin, Katniss risked her safety in order to not only avenge Prim's death but also gift the people in Panem a chance to live in a peaceful and fair country for everyone. Katniss was incarcerated for a time, and she was sent back to District 12 after she was deemed unsuitable for a trial.
It is likely that he is a relative of Hilarius Heavensbee. In the Mockingjay - Part 2, Plutarch appears to smile as he looks at Coin's dead body, suggesting that he approved of her death.
Katniss searches his eyes for signs of emotion but only finds amusement in them. She remembers that they did indeed promise not to lie to each other anymore, and she realizes that Snow wasn't lying to her about Coin's role in the parachute bombing.
Control: As the leader of Panem, President Snow wanted to maintain his power and control over the districts. Katniss became a symbol of rebellion and hope for many people, which threatened Snow's authority.
She was also against the games itself, whilst Snow believed the Districts were below him and continued working to implement new aspects of the games. Their relationship was so undesirable that Snow fired Tigris as a stylist personally.
Snow can't stand to see a young woman betray a young man's affection—his view of what happened 65 years ago. And so he takes out his old, festering wound on Katniss.
By killing Coin, Katniss ensured a chance for a peaceful and fair country, avenged her sister's death, and liberated Panem from the fascist government. The Hunger Games franchise is still an iconic series of books and movies, with the latter truly cementing the property as an international phenomenon.
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.
Answer and Explanation: Prim is killed by a bomb at the very end of the battle. Alma Coin sees an opportunity to turn the Capitol troops against Snow, and she decides the resulting loss of life from her plan is a worthwhile price to pay.
Peeta, Annie, and Beetee vote no, while Johanna and Enobaria vote yes. After some thought, Katniss demands to kill Snow. Once she receives an agreement, she votes yes, for Prim. Realizing something is up (as Katniss would never do that), Haymitch votes yes, too.
After reading the book and watching the film, it seems clear that Lucy Gray realizes Snow was responsible for the death of his friend Sejanus Plinth (Josh Andrés Rivera). If Snow could sell his best friend down the river for personal gain, it was only a matter of time until he did the same with her.
This interaction was so surprising to fans because it's not in the books at all. While, throughout the series, there's some chemistry between the two, nothing ever comes of the tension in Suzanne Collins' novels. Beyond the kiss, nothing happened between the two in the movies either.
That said, it was stated that an emergency election took place after Katniss assassinated Coin. Commander Paylor, a vital leader in the Second Rebellion from District 8 was elected as Panem's new president.
President Alma Coin is the main antagonist of Mockingjay, the final novel of The Hunger Games trilogy. She is the president of District 13 and is very corrupt and in some ways worse than President Coriolanus Snow.
Boggs reveals that Coin had wanted to save Peeta from the arena instead of Katniss. Katniss represents a threat to Coin, and Katniss made the situation worse by forcing Coin to rescue the other victors. Boggs reminds Katniss that she has outlived her usefulness to Coin.
One of the more evident indications that President Coin was a villain was her decision to put Peeta on Katniss' squad when District 13 took the Capitol. It was clear to everyone involved—even those loyal to her—that Coin's only motivation for this would be to eliminate the Mockingjay entirely.
Along the way, Snow goes on a journey of self-discovery as he grapples with his blossoming feelings for Lucy Gray and his hunger for power. Though he straddles the line of good and evil throughout the film, he eventually transforms into the villainous President Snow we all know by the end of the movie.
Katniss Everdeen: As an evil, ruthless, and calculating dictator, Snow doesn't have many close relationships in The Hunger Games trilogy. His most important relationship is with Katniss, and it's one that's marked by hatred on both their parts, though they swear to always tell each other the truth.
In the prequel book, The Ballad of Songbirds and Snakes, it's revealed that Lucy Gray Baird wrote the song after witnessing the murder of a man named Arlo Chance, who is hanged at a tree where executions take place.
By allowing Snow to live, however briefly, she's making the statement that she's not the only person those in power need to worry about anymore. Katniss has done her part, and the rest of the population has already been galvanized by her taking a stand.
Snow was 18 during the 10th Hunger Games, making him 8 when the first Hunger Games took place. This means that during the 74th Hunger Games, he was indeed 82 (74+8). So he died at 83 in "The Mockingjay," since that was during the 75th Hunger Games...
