Part of it is that sometimes the hit is small enough that it's difficult to quantify and to actually show a cause and effect, which the law courts require. That happens in many markets, where there are effects of new technology or other market participants doing things that affect one firm's profit. You have to show cause in a legal setting. In most cases we don't compensate people for innovations that destroy other people's value.
The example I use in my classes is that when DVDs came out, we didn't have a recovery program for the VHS rental business. I'm not trying to be trite; I'm just saying that this is a principle we have. If there are direct and measurable costs of improper practices, they're actionable. Market responses beyond pure liability redress are ones that we haven't been able to figure out in any market circumstances.