Honestly, I think buying and selling looted artifacts from the Khmer Rouge regime seems at least morally neutral.
> Year Zero (Khmer: ឆ្នាំសូន្យ, Chhnăm Sony [cʰnam soːn]) is an idea put into practice by Pol Pot in Democratic Kampuchea that all culture and traditions within a society must be completely destroyed or discarded and that a new revolutionary culture must replace it starting from scratch
The article really doesn't give a good explanation of why Latchford's actions are bad in context.