The issue is:
Why can’t the leftists fix the Central/South American problems left by Spain’s colonial rule?
The leftists can’t resolve the three basic core problems: (1) corruption at every level, (2) family or political favoritism over the economy and national direction, and (3) no birth control policy.
Other than Costa Rica, I can’t think of a Latin American government that corruption doesn’t affect. In most of these countries...they’ve all got populations that the jobs simply don’t exist for, and it’d serve the public to convince people to limit family sizes.