I think it's okay to mention the effect Amazon is having without blaming them. Ultimately online person-to-person trading is making fencing items easier and the people buying probably don't know they are purchasing stolen items. Amazon isn't the thesis, but it is disrupting the stolen goods market in the same way automoboles and highways lead to a spike in bank robbery.

I grew up in a poor area and we had a neighborhood fence. Let's call him 'Casey' since that was his name. Everyone knew Casey was selling stolen items and there was sort of a joke in the town about getting a 'Casey discount'. It sounds like Casey is probably operating an Amazon store now.