Jag håller med punkterna från Victim of Circumstance, Jacob C. och Ian Thompson i deras svar. Jag skulle vilja lägga till följande punkter.
Han hade inte tid eller resurser för att försöka varje strategi som vi kan drömma upp
Kraftfull som han var, Sauron har inte oändlig tid eller resurser. Sökandet efter drakar skulle ha tagit resurser ifrån andra ansträngningar, såsom att rekrytera Haradrim och påsken, att han kanske trodde mer troligt att bära frukt.
Han trodde inte att han behövde ytterligare hjälp för att vinna strider
Enligt hans visdom visste Sauron att de krafter han hade hade var tillräckliga för att säkerställa sin seger. Medan man använder palantiren är Denethor övertygad om Saurons visade seger.
‘My lords,’ said Gandalf, ‘listen to the words of the Steward of Gondor before he died: You may triumph on the fields of the Pelennor for a day, but against the Power that has now arisen there is no victory.
The Lord of the Rings Book Five, Chapter 9: The Last Debate
Page 878 (Single volume 50th Anniversary Edition)
Sauron kommer inse att ringen är allt som är viktigt
Gandalf förklarar detta till Aragorn, Legolas och Gimli:
The Enemy, of course, has long known that the Ring is abroad, and that it is borne by a hobbit. He knows now the number of our Company that set out from Rivendell, and the kind of each of us. But he does not yet perceive our purpose clearly. He supposes that we were all going to Minas Tirith; for that is what he would himself have done in our place. And according to his wisdom it would have been a heavy stroke against his power. Indeed he is in great fear, not knowing what mighty one may suddenly appear, wielding the Ring, and assailing him with war, seeking to cast him down and take his place. That we should wish to cast him down and have no one in his place is not a thought that occurs to his mind. That we should try to destroy the Ring itself has not yet entered into his darkest dream. In which no doubt you will see our good fortune and our hope.
The Lord of the Rings Book Three, Chapter 5: The White Rider
Pages 496-7 (Single volume 50th Anniversary Edition)