Seals are cute and fun to watch. They’re also a nuisance on Cape Cod, where tens of thousands of them are eating fish that might otherwise be caught by Cape fishermen and drawing great white sharks that are occasionally attacking swimmers at Cape beaches. A man was seriously injured by a great white shark August 15 in Truro, and another man was killed by a great white on September 15 in Wellfleet. These attacks, while sad, aren’t surprising. In fact, given the explosion of seals and sharks in recent years, it’s remarkable it has taken this long. More such attacks...