For years, Charlottesville has debated whether to let the YMCA build in its main city park. A private health club took the city to court, arguing the proposed deal to lease land for a dollar-a-year created unfair competition. A judge ruled otherwise, and last week city council voted 3-2 to let construction begin. The decision came after some citizens made a surprising argument. Thousands of kids could drown, because they don’t know how to swim.