I believe Sauron did posses a gift of foresight. He's wise didn't he? i believe he foresaw that someday, an heir of isildur would've rise and dispose him out of his dark throne. this lead to his effort to end the line of isildur. aragorn father and grandfather was slain by sauron's servants. If you read The Fellowship Of The Ring, Aragorn did mentioned to Frodo during their meeting at Bree that the enemy did attempted to laid trap on him. One thing that i think that unbalance Sauron's plan (he has plan for everything) is the involvement of Hobbits in the War Of The Ring. He didn't put them in his calculations just like when Morgoth mistakenly leaving the Edain out of his calculations when he made war upon the Noldor. This cost him his early campaign.
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