Sadly, the will probably isn't there, but not solving one problem doesn't mean we can't solve related problems. Some people may not believe we should, but (1) I would disagree, and more importantly (2) that isn't a legal doctrine.
Walmart, notably, didn't get there by agglomerating smaller grocery brands. They grew it organically, if with a lot of shady tactics. So there's not really a point at which regulators could have prevented the whole thing; they can only take proactive action.
Whereas here, they have an opportunity to stop a problem reactively.
My point was less "This is fine," and more, "This is inconsistent." Sorry if that didn't come across.