Owning Tesla stock this year has been anything but a smooth ride for investors. Shares in the electric vehicle maker are down nearly 70 per cent since the start of the year, on pace to finish in the bottom five biggest decliners among S&P 500 stocks. By comparison, the benchmark index is down about 20 per cent. While Tesla TSLA-Q has continued to grow its profits, signs of softening demand and heightened competition have investors increasingly worried. And then there’s CEO Elon Musk’s acquisition of Twitter. Some of Musk’s actions since taking over the social media company, including doing away...