A good and insightful post.
The only thing you forgot is to mention why Liberia is one of the most miserable parts of Africa.
Liberia is the only country in Africa founded by United States colonization while occupied by native Africans. It was financed by the American Colonization Society, an organization created to remove unwanted freed black slaves from America, to avoid a slave uprising like what happened in Tahiti. The colonizers became known as Americo-Liberians and promptly started to enslave the locals and selling them back to the US (with support from the American Colonization Society). The Americo-Liberians, led the political, social, cultural and economic sectors of the country and ruled the nation for over 130 years as a dominant minority. The atrocities under that regime were too many to count.
The US continued to keep it a hell hole in the effort to fight communism, and from 1940 and forward pumped enormous sums into the budget country (about half the GNP was American aid for a while...). Of course most of this money vanished in corruption. But in return the evil communists were kept out. Eventually there was a coup in 1980, finally removing the Americo-Liberians, and starting two civil wars, killing about half a million and displacing about half of the country population. About 85% of the people live under the poverty level today.
We sometimes speak of the Ghost of King Leopold, after the horrors in Congo. But when it comes to colonialism the American version seen in Liberia was at least as bad. And by doing it as a private enterprise they ensured that, unlike the state colonies, there never was a decolonization with support for forming a stable state.