Provide means supply, or give to you(kind of). closure means experiencing a feeling of end, of finality. When people go through a meaningfull exepirience, they often need a specific moment or event to mark it's end, the feeling you achive with such a thing is called closure. here the closure refers to the trial, so "does not provide the closure" means people do not feel the the incident is completely over becuase of the judges decition.