Only if you're fickle and lack conviction. People are talking a lot about "is Tesla at a fair valuation" and I personally believe that it's impossible to know what a fair valuation is until a few more years have elapsed.
I could reasonably see Tesla bouncing back to $300/share over the next 18 months or staying at or around $200. The current drops are more likely related to general market unease and opportunism rather than anything endemically wrong with Tesla. Also, with "momentum" stocks I'm sure some people got in looking to make a quick buck and also some people are surely taking advantage of the general shutdown-related cacophony to short the stock so they can buy it at lower prices (I would).
Fluctuations like this illustrate why one of the most important qualities an investor can have is patience. If you're trying to get rick quick, you'll be in trouble. But if you invest in solid companies that you understand, you should do well. Provided you do your homework, of course.
I'll reiterate Peter Lynch's excellent advice from "One Up on Wall Street" - if the stock drops but the fundamentals still make sense, stick around to see how the story develops.