By Gregg WendorfAdvance News JournalWith regard to violence perpetrated by the Mexican drug cartels, is there a limit to what they will or won’t do with regard to their kidnap victims?Another question: Is the violence escalating?Last but not least, is the Mexican state of Tamaulipas really the fourth most “peaceful” state in Mexico? If so, someone needs to tell that to the overwhelming number of people on this side of the border who no longer cross over into Reynosa, Nuevo Progreso, and/or Matamoros because they fear running into cartel-related violence south of the border.What happened to the five young men,