In any story, there comes a time when the villain or antagonist incites war, riots, fights, or other chaotic events for these reasons:
To shatter the bonds of a family or those between the hero and someone he or she loves.
For sadistic pleasure.
To tear a nation apart.
To start a war between two countries or nations.
To take over a kingdom.
To put the blame on someone, usually the hero.
For example, he or she can provoke someone into a terrible state or push him or her into a state that would lead to terrible events.
Rex Pester incites a huge fight, pitting the Pickles family against each other to get his name in the news.
Koba guns down Caesar and lies to the apes about his death so he can wage war on the humans.
Iago gets Cassio drunk and incites a brawl, shattering the bond between him and Othello.
In the original Mighty Joe Young, a band of criminals provoke the titular ape into a beastly rage by getting him drunk and burning his finger, causing Joe to tear down the theater.
Mor'du shatters the bond between him and his brothers, causing his kingdom to fall into war.
Under Ultron's command, Scarlet Witch provokes the Hulk into a raging tantrum that leads him to almost destroy an entire city.
Francis Begbie incites a brawl by smashing a glass over a woman's head for sadistic amusement.
Dawn Bellwether, aided by Doug, poisons predators with Night Howler serum to make them go savage, throwing Zootopia into chaos.
Kent Mansley lies to General Rogard that the Iron Giant killed Hogarth, starting a chaotic battle.
Mandalore the Ultimate rallies the many Mandalorian clans and leads them to war against the Galactic Republic.
Sa'Luk starts an elephant stampede to distract the guards and invade the Sultan's palace by stabbing one in the rump with his claws.
General Mandible deliberately sends all the soldiers more loyal to the Queen than to him on a suicide mission to attack the termites.
(As the Pickles family is being questioned about their children's disappearance, here's when Rex Pester arrives and steps out of his helicopter.) Childhood: A time of innocence, a time of joy, a time of unspeakable, unrelenting... tragedy. (He pops up in front of Didi.) Mrs. Pickles, tell us how it feels to know you may never see your children again? (Betty is now mad and jumps in front of the reporter.) (Betty DeVille: Criminy! Can't you pit bulls show some compassion?) I'm so sorry. Forgive me. (Rex turns back to Didi.) Please tell us how it feels to know you may never see your children again. (That does it. Betty lunges at Rex, but Grandpa Lou and Stu hold her back.) (Betty DeVille: Argh! Get him! Let me at him! All right! Grrr!) (Charlotte is talking to Jonathan on the phone, and the car stops next to the house where the bedlam is going on.) (Charlotte Pickles: Hold on, Jonathan. There's an alarming crowd at my in-law's indicating either a yard sale or a family tragedy. Let me get back to you.) (She and Drew get out of the car, where Rex corners them. He turns to Drew.) Hey, Mr. Pickles, how does it feel knowing your brother lost your only daughter? (Drew Pickles, furious: HE WHAT?!) Share your pain. (Drew's face grows bright red and he goes nuclear.) (Drew Pickles: YAAAAAAAA!) (With a ferocious cry, Drew leaps across the lawn and tackles Stu, knocking him to the ground and grabbing him by the arm; they start fighting) (Stu Pickles: YOU'RE BREAKING MY ARM!) (Drew Pickles: ONLY 'CAUSE I CAN'T REACH YOUR NECK!) (As Howard and Charlotte step in to break it up, Rex turns back to the press.) And there you have it - two sour Pickles and, oh! Young Tammy, baby Dale, the twins Bill and Jill, little Chunky, and poor Amelia...all vanished without a trace. I'm Rex Pester, and I'll be back with Big Action News!
~ Rex Pester inciting pressure in the Pickles Family and pitting Drew against his brother.
Humans kill Caesar! Burn ape home! Go get them! Apes must attack human city! Fight back! Come! Fight for Caesar!
~ Koba lying to the apes that humans killed Caesar, leading to a war on the humans.
Sacrifice. To some, it is just a word. To others, it is a code. (Z [to Barbatus, under his breath]: Jeez. You know, I'm really bad at word games.) (Barbatus chuckles) A soldier knows that the life of an individual ant doesn't matter. What matters is the Colony. He's willing to live for the Colony. To fight for the Colony. To die for the Colony. (Z: This guy's crazy.) (Barbatus [chuckling]: I hear ya.) At 0800 hours, we received word that the Termite enemy has mobilized. We have no choice but to launch a preemptive strike. You are the Queen's finest. I know you will all do your duty. I am proud to send you into battle. (Z: Into--I'm sor--I'm sorry, into battle?!) Dismissed. (The troops begin to march on their quest, dragging the horrified Z along.)
~ General Mandible deliberately sending the Queen's troops on a suicide mission to attack the termites.