You cite Amazon and Walmart as bad actors since they have 'annihilated local economies' -- but at the same time, they have delivered untold amounts of value by lowering prices to nearly (or below) cost for millions of consumer goods. Not to mention the time they have freed up from peoples' lives having to spend time purchasing items at various brick and mortar stores. Would it really be better if mom and pop stores were selling the same products at higher costs, wasting immense resources in the process (subsidized by consumers and possibly tax payers) due to lack of efficiency and scale?

How do you speak so confidently that they are "contributing to the problem?" It is a hard sell that they are abusing their market dominance, because of the very fact their margins are so thin. Since there are multiple market leaders, and their margins are thin, this implies they are competing fairly. You seem to take it as a given but it's a hugely complex question. I'm all for trust busting large companies abusing their power -- abuse which usually manifests in large margins.