The death of Jazz is a pivotal moment in the movie. It serves several purposes:
* Showcasing Megatron's brutal power and ruthlessness: This scene establishes Megatron as a formidable and dangerous threat, capable of dispatching even a skilled Autobot like Jazz with ease.
* Highlighting the stakes of the conflict: Jazz's death serves as a reminder that the war between the Autobots and Decepticons is a real and deadly one, with consequences for both sides.
* Setting the tone for the movie: The scene sets the stage for a tense and gritty conflict, where no one is safe and the Autobots are fighting for their survival.
However, the way Jazz is killed in the movie has also been criticized for being unnecessary and gruesome. Some argue that the scene is overly violent and does not contribute to the story in a meaningful way.
Ultimately, the reason Megatron killed Jazz is a combination of these factors. It serves a narrative purpose, showcasing Megatron's power and establishing the stakes of the conflict, but it also reflects a more violent and action-oriented tone of the movie.