Yes that dad should go to prison...its the parent(s), guardians sole responsibility to not allow your children access to guns..nor access to safe keys or anything that would allow their children or anyome elses children access.....yes its the adult who owns the guns fault their kid killed someone else or comitted suicide with their guns. It called parenting.Something many people dont do. Make no changes and you get the same results. Americans must love burying their murdered innocent children because no one wants to change anything.