I would hope he was referring to all religious/superstitious nuts equally.
Does the Bible not say witches should be murdered?

Christianity is an adopted religion by some black folks. It never was their religion before it was brought to Africa, so what the Bible says is not really applicable.
I think we are using the word "witch" wrongly (probably 'cos it's the nearest in meaning). My colleague explained to me that a witch in an African context is defined differently, and can even mean someone who is perceived to be `possessed`.
In any case, this is nothing more than primitive cultural beliefs still at play. Most modern cultures got rid of barbaric acts such as this many many lifetimes ago. There are many such beliefs and customs that once shed, evolution in Africa will become a reality. Muti murders are one such custom that is clear evidence thereof, female circumcision another, and this specific incident yet another. Don't get me wrong - there is a difference between cultural beliefs and senseless customs, and most nations will rightfully advance the former and eradicate the latter. But this is a difficult thing to get right, and requires an about turn on the customs passed on through the generations.
@xtermin8or: comparing the death penalty to a mob killing is probably the least likely way to convince anyone about the demerits thereof. Either way, this woman was not a murderer killing for pleasure. The mob, however, was killing for pleasure, and that is unforgivable, barbaric but most of all, extremely primitive.