Indeed, note that the only rational reason not to buy TWTR right now is the simultaneous belief that (a) it's not underpriced but also (b) Musk will never [be a

Indeed, note that the only rational reason not to buy TWTR right now is the simultaneous belief that (a) it's not underpriced but also (b) Musk will never [be allowed to] make the purchase. If you disagreed with either of those statements, then it would be irrational not to buy TWTR, because either way you'd profit. I have not bought TWTR.