I'm with you on the reasoning, but I hate the logic of
1. I don't understand phenomenon X
Therefore,
2. Phenomenon X must be stopped
To your point #1 in particular, it's true that normal people don't have access to HFT equipment, but they also don't own warehouses full of third-party goods (and would find those probably more difficult to obtain), so it's hard to explain in those terms why Amazon's hypothetical maneuver is different from HFT.
1. I don't understand phenomenon X
Therefore,
2. Phenomenon X must be stopped
To your point #1 in particular, it's true that normal people don't have access to HFT equipment, but they also don't own warehouses full of third-party goods (and would find those probably more difficult to obtain), so it's hard to explain in those terms why Amazon's hypothetical maneuver is different from HFT.