I rather think you confuse "rational" and "moral". If I suffer of illness X, and I have more money than someone who suffers of Malaria, then it may be rational

I rather think you confuse "rational" and "moral". If I suffer of illness X, and I have more money than someone who suffers of Malaria, then it may be rational for pharmaceuticians, for example, to look for cures against X. The market is not moral, and nobody ever said it was. It is the outcome of the decision of the market participants, no more, no less. Whining about markets that are not moral is a primitive, yet very effective form of anti-capitalism.