The articles I read describe the problematic issues being; a lack of running water in existing clinics, a lack of medical supplies, a lack of clinics and notably a lack of food everywhere - patients are escaping isolation in efforts to find food.
Liberian officials have pleaded for help in fairly abject terms (one official mentioned the possibly of nation ceasing to exist - I think that means they're worried). The details of what Western nations have done so far is fuzzy but it seems like there not been a sufficient rush to deliver these acutely needed supplies.
Sure, once the existing clinics have food, supplies and running water, parachuted in field clinics sound grand. There's no evidence I've seen that the Liberians would refuse these.