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Although he is financially one of the richest businessmen in the world, it is also worth noting that the share prices of his other companies could fall through losses on his Twitter purchase. In my opinion his main mistake was disregarding public sentiment. What is your concern?
For a genius that he is... I think there he has good reason why he has offered to sell twitter for half the price because to me Elon does not appear to be the kind of man that does something without having a solid reason behind it, although what have had planned with twitter didn't go well.
And I also agree with you that he neglected public sentiments and also most of his action made twitter looked like a place without freedom, because if anyone should go against him the person would risk losing his account.