Why were Colombian guns for hire allegedly key to Haiti assassination plot?

The hit squad that killed President Jovenel Moise is alleged to be largely drawn from veterans of Colombia's civil conflicts

When Manuel Antonio Grosso Guarin jetted into Punta Cana's tourist-clogged airport early last month on Avianca Flight 252, immigration officials are unlikely to have given the 41-year-old Colombian a second glance. Visitors from around the globe flock to this Dominican resort town each week in search of sun, sea and Caribbean sands.

Grosso appears to have had rather different plans, though: to sneak over the border into neighbouring Haiti and help assassinate that country's president.