There is a lot of debate over the racial implications of white magic vs black magic. It is a touchy subject for some. Cultural differences between white practices being ok vs black traditional practices somehow being bad and thus really not accepted. I dislike the colour attachment. I prefer to respond about good intent and bad intent rather than colour if questions. It sits better for me. Witches are human, they can be good, bad or plain ugly in their intent.
The issue with magic is that it comes with it perceived power, and with that perceived power the presumption of the opportunity of control. This presumption of opportunity of control leads to fear in those that fear what they do not understand as they assume it will be taken advantage of, and leads to others who are looking for opportunities to exploit people feel like they have the opportunity to do so.
Absolute power corrupts absolutely. Every area of civilisation have people looking to feed their egos and need for a power trip. Witchcraft is an aspect of civilisation. Also civilisation has always feared what it doesn't understand.
The problem with fear is that it makes people very easy to control. It will always be harder to influence someone who is happy and content. By inducing fear in society you can manipulate it far more easily into a specific way of thinking. Governments have known this for generations and generations. Marketing companies sell the problem not the product. Such that they make the product seem needed by creating a problem that might not have been a problem until people were told it was a problem iyswim.
And it is interesting to see the shift in attitude about women from pre-Christianity, where typically they have a much more influential role in society. To Christianity where they are seen as far more problematic. If you were cynical you would almost consider the option that by creating fear in woman and their power, you would have a need for the solution provided by Christianity. Witchcraft and the persecution of witches has actually been documented as being used to specific induce fear and thus control people in England when the Christian faith was dwindelling. One of the Kings specifically wrote a paper on it and it formed the basic of one of the witch hunts. (sorry I can't remember which one or even where I came across it atm, but can have a think and hunt if you are interested in knowing more - it just wont be quick in response I am afraid. I have over extended myself)
I think a lot of people who are new to witchcraft think that it is the solution to all of their problems. But generally mundane solutions will be far more effective and in worst case situation magical workings will always come with mundane work to help the working. It is like asking magic to give you a new job but not apply to any. Magic can help but it can't achieve the impossible. People forget this and this it leads to fear of things that actually and practically are much harder to achieve and maintain. It takes a hell of a lot of work to curse and maintain a curse, people are just not so likely to do this.
The power of suggestion is strong and people underestimate it greatly. If you fear that someone will curse you, you are much more likely to believe that someone has if things happen that are not as you deem beneficial, and you are more likely to jump to this conclusion than someone who doesn't believe it is possible to be cursed by someone and might put it down to bad decisions/timing/luck.
(sorry long and rambley and a bit abrupt - work interrupts)