According to me, black magic or white magic depends on ones belief or disbelief. Black magic or white magic only exists within the minds of the people who believe in it. Its intensity depends upon the mental strength of a person involving in this .To be free from it, you should be mentally strong. When a person is ready to face any crisis and has a willpower, he can survive in any situation.. So there is only way to be free from any situation is to face every problem and never lose hope.
But there is no concrete evidence that black magic works on other people or things. But that said, the power of the mind to create its own reality is very strong, and there can be serious repercussions to this.Take, as an example, snake handlers. They are utterly convinced that they can handle snakes without risking snakebite. Their faith, their belief, tells them that this is a fact. So they proceed to handle snakes. and they get bit. And they die. Why? Because the snake hasn't heard about the handler's wondrous powers of snake-handling.
This term black magic was introduced by the British. They called tantra, magic’ and certain tantra practices which are not good as per society norms were called black magic. However tantra doesn't see anything as good or bad. In tantra, every practice is an action and will have its own reaction What is commonly known as black magic or white magic are certain tantric rituals. As i said, tantra doesn't see anything as good or bad, it works on the basis of karma.
Suppose i do a certain tantric ritual to control someone, in that case i’ will need help from the cosmos or the ethereal bodies. The cosmos or ethereal bodies don't do charity work. If I am taking their help for something, I must repay them for that help. Contrary to what people think, no one can perform a tantric ritual for any one. If you want to strike someone with the weapon of tantra, you 'will have to perform the ritual yourself. The process is extremely gross and scary. Understand you are inviting higher ethereal bodies, giving them access to yourself without knowing anything about your own safety. Even if you succeed at it, which is 99% unlikely, even then it won't work for ever.
The discussion around black magic and white magic encompasses deep and nuanced beliefs about the nature and ethics of magical practices. These terms traditionally distinguish between magical works based on intent, black magic being associated with harmful, selfish, intentions, and white magic aligned with healing, protective, or benevolent purposes. However, the perspectives on and validity of these classifications depends on ones belief. This is my opinion