Do long prison sentences deter criminals or are they an indication of a severe crime problem?

Colombia has the longest average prison sentence length, at 137 years. It also leads the world in kidnappings (total, per $ GDP and per capita), murders per capita, mortality due to assaults by explosive material(total and per capita), mortality due to assaults by other and unspecified firearm discharge per capita, and mortality due to assaults by sharp objects per capita.

Colombia is second for murders with firearms (total and per capita) and third for total murders. It is also in the top five for mortality due to assault in 18 of the 22 recorded categories.