The only reason a developing country would want capitalism to generate wealth is because the established capitalist order will blockade or otherwise decimate any country which tries to step out of line. We've seen it time and again throughout modern history. Planned economies work for developing countries. They work so well that capitalist countries will band together in order to isolate those economies from the world out of fear of contagion. This was, for example, a key reason capitalist countries tried to contain and isolate the USSR and China, before both started embracing liberalization policies.