When you grandpa living in a village ask you for buying him a couple of TSLA shares. Buy when the street sleeps, sell when the street starts buying. Remember, hot or not, trees do not grow to the sky. Insiders knew the second offering info and now they are selling to buy at lower levels.
You should sell a little before company reaches its maximum growth potential. So when Nokia was holding 70% of cellphones market share, then it was right time to sell. Tesla will reach near to its maximum growth in maybe 10 years maybe 20 who knows