The part of the PBS/ProPublic documentary Charles Taylor and Firestone that was really shocking was the extent to which Firestone supported Taylor in the early 1990s. They could not operate without his permission, so (in hindsight, I guess, though the decision seemed pretty black and white at the time too) they really should have just not operated until things stabilized. Instead, they chose to cooperate with Taylor, who was of course at the time a warlord and not president. From the accompanying article:
The company signed a deal in 1992 to pay taxes to Taylor’s rebel government. Over the next year, the company doled out more than $2.3 million in cash, checks and food to Taylor[...].
While Firestone was operating:
Taylor used [Firestone] for the business of war. Taylor turned storage centers and factories on Firestone’s sprawling rubber farm into depots for weapons and ammunition. He housed himself and his top ministers in Firestone homes. He also used communications equipment on the plantation to broadcast messages to his supporters, propaganda to the masses and instructions to his troops. [...]
For Taylor, the relationship with Firestone was about more than money. It helped provide him with the political capital and recognition he needed as he sought to establish his credentials as Liberia’s future leader.
The effect of Firestone’s cooperation with Taylor on the war is unknowable. After all, Firestone needed to cooperate with him precisely because he already controlled so much of the country in 1991. In the short term, though, it seems clear things would have been more difficult for Taylor had they just stayed out of the country for a few more years.