Cures are Harmless but are prohibited

 Chinuch (231) And Rambam,  said  as the reason of the commandment that it is in order that the soul of the one that curses not be moved to vengeance and that he not become used to anger. And he wrote at further length about this in his book. And it appears to me from his words that, in his opinion, he does not see any injury to the one cursed from the curse, but rather that the Torah is distancing the matter from the perspective of the one that curses — that he not accustom himself to vengeance and anger and to lowly traits. And we shall accept all the words of our rabbis, though our hearts hold more of what we have written.