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That argument seems to prove too much? It's sort of an Efficient Market Hypothesis for government regulation, and it would apply just as much to e.g. FTC and DoJ with respect to anti-trust violations as to Congress (as thread parent would like) or DoJ or whomever with respect to fraud or illegal wiretapping. Maybe it would be better investigated by a class-action plaintiffs' attorney, but even the mightiest firms might hesitate to wage the discovery battle that would be required against such deep pockets.

I believe anti trust is triggered when it negatively affects consumers, with Amazon’s aggressive competition consumers usually win. At least short term...

Antitrust isn't about stealing business from your competitors, it is about colluding with them to rip off consumers by fixing prices.