The symbolic Hunger Games was only the first of many bad decisions to come down the line, and Katniss only voted yes to make sure Coin didn't become suspicious of her.
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 is ready to take action against the Capitol and the Careers, and she wants to avenge Rue's death. Her promise to Rue gives her the drive to win, even more so than her promise to Prim. It is also Rue's death that makes Katniss want to shame the Capitol.
Why Katniss does not believe that she can win the Hunger Games?
Katniss doesn't believe that she has any chance of winning because tributes from the wealthy districts have grown up training for the Hunger Games. They see it as an honor to serve as tribute, and tributes from those districts almost always win.
In the end, Katniss and Gale grew apart, as many childhood friends and young loves do. She needed something different in her life, and with Gale's link to Primrose's death, Katniss found a reason to cut ties. If Katniss ever wanted to find comfort again, she knew she had to return to Peeta for the long term.
Although she will never know for sure, Katniss does recognize that she cannot be with Gale. She will never be able to forgive him for his idea — the parachute bombs — that killed Prim.
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.
So when he said 'I'm with the Mockingjay' it meant that he trusted that the Mockingjay (as the face of the rebellion) would do the right thing for the cause they had both fought for. 'Yes...for Prim' might also have alerted him since Prim wouldn't have wanted that. And neither would Katniss.
According to the star behind Effie, Elizabeth Banks, she and Haymitch's Woody Harrelson improvised the scene. Considering she's been adamant about the characters having some romantic connection, it only makes sense that they'd share a goodbye kiss. It's very on-brand for Effie, as well.
Katniss had lost her trust in Peeta when she realized he had allied with the Careers. She assumed he was helping them to find her in exchange for remaining alive longer himself.
Katniss never hallucinates about her dad's death after being stung by tracker jackers. Rue's dad doesn't start a riot in District 11 after his daughter's death. Haymitch doesn't convince the Game Maker to change the solo victor rule.
This suggests that Katniss loves Peeta, and not just because she feels that she owes him her life. Instead, Katniss wants to protect him and bring him home because she has strong feelings for him, even though she isn't sure what those feelings mean.
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.
She expected their years of friendship would make it harder to kill. But she knows her one and only true ally is Peeta, so she decides she must kill Finnick now. Katniss climbs down from the tree, determined to kill him now before he has the chance to kill her.
Toward the end of the novel, Katniss realizes that Haymitch has been keeping information from her and using her to help the rebellion, causing her to feel extremely betrayed. On the other hand, his goals are generally good ones.
What happened to cashmere after she won the Hunger Games?
Immediately after Gloss's death, Cashmere charges at Katniss with a knife, apparently intent on killing her, but Johanna digs her axe into Cashmere's chest, killing her.
Finnick learned many secrets, including that Snow, in his rise to power, poisoned his adversaries but to divert suspicion often drank from the same poisoned cup followed by an antidote that only Snow used. Segments of the propo of Katniss and Finnick are aired.
After winning the games, Snow forced Finnick into prostitution and sold his body to Capitol residents to gain their trust. Finnick only agreed to take part because Snow threatened to torture his loved ones. Even though he bedded several women throughout his time as a victor, Finnick's love for Annie remained true.
She is angry she wasn't informed of the plan and lashes out at him. Despite the fact that Haymitch has been working since the very beginning to save her, she cannot forgive him for letting the Capitol take Peeta alive.
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.
Peeta decides, though, that he will go out on his own to act as a diversion in case Katniss and the others need it. Gale gives Peeta his nightlock pill in case Peeta's captured. They leave early in the morning, bundled up and styled by Tigris. Cressida and Pollux go first, leading the way to the City Circle.
Thankfully, Katniss noticed the clues. President Alma Coin presented herself as Panem's salvation in The Hunger Games, but several moments in Mockingjay hinted that she was an even worse villain than President Snow.
