You still don't understand growth companies. Who cares about trailing 12 month P/E for a growth company? Especially a company growing at such a ridiculous rate. In Tesla's case, 50% annual growth (minimum) while still managing to increase margins. Tesla's P/E was 800+ less than 1 year ago. What does that tell you?
As they continue to refine their manufacturing excellence, bring battery production in-house, localize supply chains, and reap the benefits of economies of scale, I think they'll be ok. Insanity? Yes. Insanely profitable.
But you keep watching that P/E. Maybe you'll jump in when the the P/E is around 50 and the share price is $5K.