If that growing middle class becomes dependent on westerners for employment, they will become westernized. Colonization can be extremely 'peaceful'.
You get people like this criticizing even the most minor form of foreign employment from a western corporation but absolutely nobody gives a crap when foreign aid is used to subsidize weapons manufacturers and directly destabilize a country by providing perverse incentives.
You dismiss dependence on westerners for employment but do you know what the alternative is? The alternative is to do everything yourself and there is no way you can compete against western nations because they band together while every African nation tries to stay independent and dislikes their neighbor just as much as they dislike westerners.