Oh, he has every right to do so if he so desires. But it is an opportunistic cash-grab, and those of us who don't like opportunistic cash-grabs may disapprove.
Far as I understand it, his book is not solely about the earth being round, it's just another of his science books.
He devotes a chapter to it, I guess in part because of the recent interest in this movement.
If anything it's a compliment to you guys, the publicity is such that he feels it's something worthy of responding to.
If he's an author then he's obviously going to write about things he thinks people would be interested in reading about.
He's not making money out of some tragedy so I don't see the problem here.
Isn't Tom writing a book, an updated ENaG? If so won't he be making money out of the recent interest in this movement?