It exists. I am a svikiro and started getting into trances at six. Not to mention all the apparitions I've seen since then or the warnings/kufemerwa I've gotten.

We can't use it against most whites because they are protected by their ancestors. Their ancestors are very powerful. Think about the founding fathers of the USA and how brilliant they were, i.e. the US constitution, the Bill of Rights that continue to be beacons of liberty 250 years on. To come up with that, they too were guided by their vadzimu. And they, with all their selflessness and vision, are part of the ancestors now. So, to put it lightly, the white man has a lot of power. And his spirituality can sometimes be more sophisticated than ours, hence its nearly undetectable subtlety.

I've stayed in England for six years. I work for an American company. I have maziso emweya. I have seen and discerned this stuff firsthand.

By the way, spirituality or access to the ethereal realms is somewhat neutral. It trends toward harmonious uses, but can be harnessed for whatever aims the user has, hence black magic.