A Sound of Thunder by Ray Bradbury

I ask myself if someone had read this story before today, I want to know his opinion, and discuss about the idea of the author
and for whom who had not read it yet, I give them the summary, maybe they'll find it interesting;

On the eve of an American presidential election, a party of rich businessmen undertake a time travel safari to the past to hunt dinosaurs. While the organizers have taken every precaution to minimize the impact of the hunting party on the past,
one member violates the rules and leaves the designated path. Upon their return to the present the group finds that the world has been drastically altered by the seemingly innocuous death of a pre-historic butterfly.