I'm often not hard on Africa's founding fathers'(Lumumba, Nkrumah, Nyerere, Sylvanus, Kenyatta) political philosophies and leanings, because for them to get things absolutely right they needed to be superman essentially, however one thing I cannot absolve some of them of is the precedent of corruption that some of them set.
Lumumba was backed into a corner basically by the US and killed, if you seek help from one party and it declines, you"ll obviously run to the other. The only thing he was guilty of being is a nationalist.