We warned China to stop its incursions into Taiwan’s air-defense identification zone — and the Chinese responded by flying even more aircraft into the zone. The 52 Chinese flights on Monday brought the total for October to 145, already the year’s highest monthly total. The flights have been steadily increasing in recent years, as Beijing harries Taiwan and demonstrates its discontent with the island nation’s closer relationship to the United States. The Chinese may also want to wear down the Taiwanese by forcing them to constantly respond. Regardless, the flights underscore why Taiwan is the most dangerous and potentially most...