How exactly was that answer reached?
The Human Development Index is an objective system designed to rank the world's countries based on comparative measures of education, literacy, life expectancy and standards of living. This system is often used to categorise countries as developed, developing or under-developed, and it also measures economic policies and child welfare.
A United Nations initiative, the Human Development Index was established in 1990 to inspire a shift from an international focus on financial viability to one that centralises on social development and progress. In this new system of development indexing, a country's economy now functions alongside its peoples' access to education and their guarantee of a long life.
On the most recent index, Chile ranked 45th internationally. Argentina was ranked 46th, Uruguay 52nd, Panama 54th and Mexico 56th.
In regard to the safest versus least safe debate, FTI Consulting conducted its research based on local police stations and NDOs in each Latin American country. Its system ranks nations on a scale of one to five, with 1 designating the safest countries and 5 designating the ones that are the least safe. Costa Rica, Chile and Uruguay rank 2 on this scale, which means that their crime rates are stable. Argentina is facing myriad drug crime issues, and city crimes remain the nation's second highest cause of danger.
As Chile and Uruguay rank high on both lists, they can be seen as the best and safest Latin American countries.