Jules Ann Asked: Does this make sense?

I'm writing a series of books about witches and psychics. I have been working on developing the origin of the species/how their powers work etc. and I was wondering if this idea is logical. It would be implying evolution as a fact. Does it make sense scientifically for the origin of witches and psychics to be mutation of humans? And then they survived as races because of "natural selection"? Thanks in advance!
PS. I know, this isn't really a Books & Authors question, but I figured I would try here because I'm not getting any answers in the Biology section.