What is a good idea for a short story using butterfly effect and time travel?

In a small town, a timid scientist invents a time machine and travels back to the day before a tragic accident claimed the life of a beloved local teacher. He saves her, but in doing so, he inadvertently alters the future, leading to the rise of a corrupt politician who wreaks havoc on the community. As he races against time to fix his mistake, he learns that every action, no matter how small, can have monumental consequences. Ultimately, he must decide whether to restore the original timeline or accept the new reality, grappling with the weight of his choices.