Lack of clearly defined roads and specific parking areas mean cars are moving through large crowds of people without good separation between vehicular areas and pedestrian areas. Cars moving through crowds of people is inherently dangerous. Spring Break drivers are likely to be more careless than drivers during other times of the year. Young drivers are statistically more likely to drive carelessly or arrogantly than older drivers. Spring Break crowds and, therefore, drivers are predominantly composed of very young people.
Alcohol increases the chance of accidents when moving vehicles are present.
Alcohol is heavily used both by Spring Break crowds and drivers on the beach. In recent years, a number of deaths have occurred involving cars and pedestrians on Texas beaches during Spring Break season. Now take a few minutes to outline this argument. I just remember that everything to the right must help to prove everything to the left, and then I make judgments about whether my evidence is convincing. This is a valid and valuable way to use outlines - not so much for planning as for careful checking after a writer has a draft of an argument.