If Einhorn has any sense, he should make the letter short and sincere, use this opportunity to learn a lot from Musk and the tour. If I were Elon, I wouldn't treat him nicely based on his letter. He has a lot to lose from shorting Tesla, it's not a time to be arrogant and waste the opportunity. Elon knows the stock will go a lot higher, many fold higher. He is just trying to help out a short (ultimately to reduce drag and noise on Tesla going forward). But this short is too arrogant to understand the situation.
I found the whole Wall Street is pretty arrogant and stupid. They think they are creating value. In reality they are just a bunch of blood sucking parasites sucking blood from the society.
Farmers grow food; teachers teach students; doctors treat patients; Costco helps to distribute products with a small profit; Tesla builds nice products and making the world a better place...
Blood sucking is fine, because the society has set up to treat that as a legal activity. But suck quietly. Einhorn is comparing his stuff with what Tesla is doing, unbelievable.