It was important to stop racism since Dr. King was a person who was bullied was too many times so he wanted others not to get bullied just if their skin color is darker than others and he just was an optimistic person for the furture generations to end this. (This is just a small starting point try to work off of this and read the "I have a dream" speech for a bit more info but yeah use this as a small lead and work off of it and I'm sure you'll create amazing writing pieces!)