If they don't know what the meat is, then they don't know whether it's fit for human consumption. If it was just a case of mislabeling edible meat, then fine. It would still be unacceptable, but we have absolutely no idea where this meat comes from, what is in it, when and how it was killed and butchered, the veterinary history of the animals involved and so forth, and it's been ages since since this scandal broke. If an actual criminal investigation can't reliably trace this meat, something is badly wrong.
Not all meat is safe to eat. Next time something like this happens, it could make people seriously ill. People could die as a result. This scandal isn't actually about how horsemeat is icky, none of the affected countries ban the sale of horsemeat. The issue is that if people are able to get away with passing off the wrong type of meat for profit, it's reasonable to assume that sooner or later someone is going to pass off meat which is unfit for consumption for the same reason.
Not all meat is safe to eat. Next time something like this happens, it could make people seriously ill. People could die as a result. This scandal isn't actually about how horsemeat is icky, none of the affected countries ban the sale of horsemeat. The issue is that if people are able to get away with passing off the wrong type of meat for profit, it's reasonable to assume that sooner or later someone is going to pass off meat which is unfit for consumption for the same reason.