It is the state of mind of the person wielding the instrument that determines to what end it will be put.
Fetishes are literally viewed as fake forms of attraction. The fetish concept is used to delegitimatize attraction to any and all bodies that are not considered normative. This is why people are accused to have transgender fetishes and fat fetishes and disability fetishes, but never cisgender fetishes, thin fetishes or able-bodied fetishes. Even in cases in which the person in question exclusively partners with these latter groups.