Unfortunately FARC is afaraid of everything , and they cope with fear by takeing hostages.
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They are not afraid of all the nasty critters that live in the jungle, of which there are many.
Most of them are not even afraid of chupacabras, the number thirteen or clowns.
They take hostages to extort money. That does not make them cowards. It makes them immoral.
Cowardice and immorality are different concepts.