It's been a crazy ride for Space Exploration Technologies Corporation, or SpaceX (LSE: SPCX), stock. Why did this tech share fall to earth? Others hoped that a wave of buying by US index trackers would support the share price. Brave, contrarian investors will be tempted to take advantage of the SpaceX backlash. If tempted, I'd suggest investors feed money in gently, in case SpaceX has further to fall.