The phrase "reasoned case" means presenting logical and well-thought-out arguments or explanations to support a certain point of view or opinion. Full definition
For what should be obvious reasons the case law concerning opening statements is concerned almost exclusively with jury trials. (lklaw.ca)
For some unknown reason the case had not been allocated to the small claims track. (newlawjournal.co.uk)
«Though the author makes a fairly well reasoned case for someone of a religious persuasion for why mormonism is NOT a cult, as an agnostic / secular humanist both mormonism and christianity fit the definition of a cult.» (religion.blogs.cnn.com)