Updated: Jul 9, 2019
“Some demons are of a nature such that they only understand curses, and are not amenable to courteous command” -Aleister Crowley
Should someone try to harm you directly or indirectly, cursing is one of many tools at your disposal to prevent (or punish) such actions. If another person purposefully disrupts your “orbit”, they are going against you as a force of the universe. They are interfering with YOUR True Will.
Of course psychic self defense should be developed and if practiced diligently - it should prevent interference by others in unwanted ways. But consider being open to other measures when under duress or in crisis. The world is not black and white and neither is magick.