Okay... you are an uneducated person who's never had any experience with modern medicine before (Liberia has 250 doctors (and heavens knows if their training is any good) to serve the entire country of 4M people; the US has 834,000 doctors to serve about 100x the people.), your family member is ill, and a bunch of people in really scary outfits right out of a Hollywood movie just grabbed your sick family member and loaded him/her in a truck to a quarantine facility. You are naturally suspicious because lots of people have died in your village before, and the authorities (who have a well-earned reputation for being a bunch of useless kleptocrats) have never given a flying *bleep!* before. But you certainly do have plenty of experience with the thugs hauling your family members off in trucks, never to be seen again.
Deciding you want your family member back home is not an unreasonable thing to want to do, in the face of whatever sinister purposes you think the central government might have in mind.
That said, I'm sure more than enough of them, like many rioters and protestors everywhere, were there for the looting. Because nothing says "Fight The Man" like taking a bunch of swag.