@HolyShmoakes
No I wouldn't. I get 'attached/sentimental' over pretty much everything, but soiled disposable nappies, even I can't get fussed about. It's a used nappy. It makes no difference to me if someone finds a use for it.
As I said, I think it's disturbing from the 'blokes' point of view, that he wants to do this, but from a parent point of view, no it doesn't 'upset' me.
I don't think they see a child's nappy as items of sexual intent at all. I think they must just see the contents as something to facilitate their fetish (having their nappy changed, to me it's no different than buying formula.
buying the formula isn't disturbing or sexual.
they need some serious mental health help though.