Visum for entering Cuba

[RedArno]

Today I saw something on television about a Chilean woman who lived in Belgium (as a state citizen) and who was not allowed to board a plane to Cuba without a visa at first. Only when they realized she was a Belgian state citizen she was allowed to go.
So my question is: Why can Belgian state citizens enter Cuba without a visa, while Chilean citizens can't?

Thanks in advance, I hope this is in the right section.

[Q]

It probably has something to do with the restrictive laws Belgium has for "illegal" migrants.