With a population of 61,000, the city, which calls itself the “Butterfly Capital of the World,” is not known as a stage for pervasive violence. It is home to the sprawling Wynmoor retirement community and the Seminole Casino Coconut Creek. Its Mainstreet Project, which is under construction, is “a 23-acre, open-air, upscale shopping and restaurant center,” according to the city’s website.