Well, you have an interesting definition of "mass slaughter", pdq. Does it all have to happen in a period of a few weeks for you to consider it a "mass slaughter"? How about deer season here in the US? Wouldn't you consider that "mass slaughter" in the animals' native habitat? But we justify it because the deer overpopulate if we don't. How about duck and goose season? Wouldn't you call that mass slaughter?

Why are people only pointing fingers at the seal hunt in eastern Canada? It's because they can raise more money using pictures of cute and cuddly little doe-eyed furry seal babies (which are not even being killed at that stage of development) than they can using pictures of other animals which are being killed in even greater numbers. That, and they don't have the guts to stand up to the sports hunting industry in this country, so they pick on people who are easier targets.