I don’t understand why people think that casting a curse will automatically have repercussions.
Let’s think about this logically. Someone wrongs you, legitimately, and you cast a curse on them. According to the Law of Attraction, you’re returning the negative energy they aimed at you.
Unless you’re casting unnecessary curses on undeserving people, you’re probably safe.
Aside from that, a witch who plans on cursing should know to take the necessary precautions before casting a curse and be confident in their methods.
I would also dare to say that someone who really believes that they’ll be negatively affected by casting a curse is more likely to suffer from it than someone who doesn’t.