RIO DE JANEIRO, BRAZIL - El Salvador's president loves to tweet passionately, preferably success stories. He has had many to announce since taking office in June 2019, mostly on statistics. As soon as Nayib Bukele was sworn in, the number of monthly homicides dropped. At the end of the year, the total number of murders stood at 2398, nearly a third less than the previous year. In a global comparison . . .