@Henrik phil,
Zimbabwe isn't worse
because of the removal of white citizens (NOT "settlers"). It's worse because of the manner in which this policy was effected, which was basically army-enforced intimidation and government-promoted pogroms and violence. If Mugabe weren't an insane megalomaniac, he could have returned Zimbabwean land by purchasing it from the white population, or creating term-leases, which is what had been suggested all along. But because he chose to do this through violence (and at the same time through political repression), the country's foreign investors left, they became diplomatically isolated, and they suffered agricultural and economic collapse. Mugabe also turned away foreign food aid. So I think it's naive to blame Zimbabwe's problems on "removing white settlers". And considering that 30-40 years ago those white settlers in (then) Rhodesia had a brutal apartheid regime, it's hard to argue that they were better off at the time.
I agree with you that social and economic transitions take time. But because of growing populations, because of recent unrest and political change in nearby countries, and because of AIDS, Zimbabwe would be in a time of transition
anyway as is all of the developing world. It is therefore not a microcosm of this change from colonial governance, which I might add was not uniformly applied in Africa. How can you compare the brutal scorched-earth colonialism (and genocide) of the Belgians in Central Africa with the much longer term colonial "investments" of the French in Cote d'Ivoire and Senegal (not without its crimes, but far more "stabilizing in the end").