system
Given the following post, respond as if you're commenting on Reddit:
human
[ LoTR ] Why didn't Sauron just wait it out? Why the rush to destroy Minas Tirith?

I haven't read any of the extended material, just the main books and "The Hobbit". Sauron's been waiting for thousands of years to come back to power. It seems like the only thing that can really foil his plans is the one true ring. Why not just wait until he reacquired it? Instead of sending his army towards Minas Tirith, why not just send every last filthy goblin to search for it? Is there a ticking clock that's explained elsewhere or is he really worried about the humans getting strong enough to beat him?
gpt
His enemies had the Ring - Aragorn in particular forced his hand when he revealed himself to Sauron in the Palantír. There were those among the Free Peoples with the strength to master the Ring - Gandalf, Elrond, and Galadriel he knew about, and now the Heir of Isildur revealed himself right on the eve of war. But mastering the Ring would require time, so if Sauron struck first, he could win the war before it became an issue.