Property and justice

Exploitation can be avoided by not buying stuff that was produced under exploitative conditions. But what about stuff that you have bought already? If it has been unfairly traded that just means that you paid less money then you should have paid. Or you got more stuff than you should have gotten for a certain amount of money. Whatever angle you view it from, protecting your possessions is like reaffirming the justifiableness of their trading. The social gap widens as the poor are underpaid and the rich achieve returns. If my bike gets stolen by somebody who works on low wages, why bother? It's poetic justice in a way.