Tesla is having a tough year. Once a world leader in the electric-vehicle market, the company’s sales across the U.S., China, and several European countries fell year on year in February, and its stock price dropped almost 50% from a mid-December peak. Tesla needs India more than India needs Tesla. The politics of Tesla leader Elon Musk and surging Chinese rivals are both contributing to the sales slump. In Germany, where Musk supported the right-wing populist party, Tesla’s sales collapsed 76% ...