This column is from Trendlines, my business newsletter that covers the forces shaping the economy in Boston and beyond. If you’d like to receive it via email on Mondays and Thursdays, sign up here.Dr. Jekyll and Mr. Musk were inescapable last week as SpaceX’s record-shattering initial public offering made Elon the world’s first trillionaire.The good Musk is a visionary who has pulled off what many thought impossible — turning Tesla into the world’s most valuable car company and pushing the frontiers of the space economy with SpaceX’s rockets and internet satellites.The bad Musk is a shameless troll who traffics in...