After all, she had technically betrayed the current government since the public wasn't aware of why Katniss would kill President Coin. However, Katniss killing President Coin was necessary to ensure that Katniss, the Capitol, and the 13 Districts were liberated from the fascist government of Panem.
In The Hunger Games series, Katniss killing President Coin instead of President Snow surprised many. Still, it was because Coin was revealed to be a ruthless leader with her own political interests.
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.
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.
And then to top it all off, after working under Coin for probably years, he secretly knew Coin was evil and "planned" (predicted) Katniss would execute Coin all along.
Katniss Kills Coin | The Hunger Games: Mockingjay Part 2
Why does Plutarch smile when Coin dies?
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.
Such encouragement is what Katniss needs as she continues her development as the Mockingjay. When Boggs tells her not to trust “them,” he is possibly referring to Coin, who Boggs has already said is afraid of Katniss because Katniss hasn't given Coin a full-hearted endorsement.
Alma Coin was the true villain of The Hunger Games, with Katniss actually seeing her as more of a threat than Coriolanus Snow. At the same time, it was Snow who was made out to be the bad guy in previous movies, making some question why Katniss killed Coin and spared him.
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.
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.
Before the Capitol battle, Gale had explained to Katniss his series of bombs designed to feed off human compassion: a small bomb would go off, and then when medical aid rushed in, a second bomb would go off, killing those people as well. Incidentally, it's this exact type of bomb that took Prim's life.
Did Gale mean to kill Prim? No, Gale did not mean to kill prim but he still designed the bomb. But, although he holds a small fraction of responsibility, he never meant for Prim to get hurt.
Using knowledge from the movie and the books, let's break down how The Hunger Games ends. Coin killed Prim to destroy Katniss because, as Boggs (Mahershala Ali) explains before his death, Katniss is her biggest threat to maintaining her power over Panem because of the influence Katniss has over the people.
Katniss also realizes that, even though Gale had nothing directly to do with Prim's death, the bombing trap that killed her was based on one of his designs, which makes both him and Katniss feel he is somewhat responsible.
Did Paylor know about Coin? When Katniss emerges, Paylor asks her, "Did you find what you were looking for?", and Katniss holds up a rose, which Paylor takes as an affirmative response. This seems to imply that Paylor was somehow aware of Coin's betrayal and wanted Katniss to find out.
President Alma Coin's proposal, exposing her villainous nature. President Alma Coin is the main antagonist of Mockingjay, the final novel in The Hunger Games trilogy and both of its 2014 and 2015 film adaptations, The Hunger Games: Mockingjay – Part 1 and The Hunger Games: Mockingjay - Part 2.
At an unknown point in time years before the 74th Hunger Games, she was personally fired by Snow, the stated reason being due to her being too surgically enhanced.
This comes as a result of Lucy attempting to leave Snow during a rainstorm after they plot to flee the Districts, but she learns that he was responsible for killing Sejanus Plinth during the travels.
Haymitch Abernathy, the mentor for Katniss and Peeta in The Hunger Games, won his own Hunger Games through smart tactics and outsmarting his opponents. Winning the Hunger Games came at a great cost for Haymitch, as President Snow ordered the death of his family and girlfriend as punishment for his rebellion.
Katniss blamed Gale for the death of Prim. She would never be able to look at him again without thinking of his part in her death. Gale was the best friend he could have been to her at that moment. He knew her so perfectly to understand this, he knew his chance with her had passed.
Cressida is a talented director with a keen eye for useful footage. Her desire to film Katniss in action is so great that she lies about Katniss's plan to kill Coriolanus Snow in the hopes that Katniss will act heroically on camera.
Black, oily matter spouts like a geyser from the street, billowing between the buildings, creating an impenetrable wall of darkness. It seems to be neither liquid nor gas, mechanical nor natural. So it's a tarlike substance designed to drown people.
In the chaos, the hijacked Peeta Mellark found himself triggered and tried to attack Katniss Everdeen. Mitchell intervened, but Peeta threw Mitchell into the other marked pod; it turned out that the net was made of barbed wire, piercing him instantly and hoisting him overhead.
