@Astralbee It is guilt-tripping... your entire post is about the concept of making them feel bad about what they do. And if you do not see why this is ineffective, just examine your own feelings and your reactions right now,
because I am doing the same to you with these comments. And since you are feeling negativity here for being told "you done wrong" (you even -1'd for it), then it must be assumed that this is what OPs folks will feel. And — again — you are
ignoring the drive that made them buy stuff in the first place and leave that in place, while introducing a guilty conscience. —
MichaelK 1 min ago