There's more to Voodoo dolls than usually portrayed.
A voodoo doll doesn’t actually symbolize a person in the respect that what happens to it, happens to the person. Instead, a doll is only associated with the person in question—usually by using a photo of the person, or something that was in personal contact with them, like a lock of hair (attaching this personification is actually the purpose of the voodoo straight pin usually seen in a voodoo doll, which is commonly believed to be an instrument of pain).
Other things are usually added to the doll, depending on the intended purpose.
Garlic, flower petals, perfumes, or even money can be added—not as a direct message to the person, but as an appeal to the spirits to open themselves to the doll and the desires of those involved.
The voodoo doll can be used for all kinds of reasons, and most have good intentions.
The voodoo doll itself is neither good or bad but, it reflects those person using it.