That this because regulation purpose is not fixing a problem, but making government look good. Many people does not think in terms of 'flow of foreign capital'

That this because regulation purpose is not fixing a problem, but making government look good. Many people does not think in terms of 'flow of foreign capital', but in 'greedy exporters are hiking prices to get rich'. So forbidding exports and fixing prices look good to them (especially with propaganda support), while macroeconomic effects will go unnoticed. (from experience in Russia, but Argentina looks quite similar in political structure)