All the Darkness has to do is blow up the tower, then it's game over lel.
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They've been dead for a long time and the earth has been decimated. There homes have been destroyed. They have no families. The tower is the only obviously place to live. Also it's protected by the traveler
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Because that wizard came from the moon.
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Well if you believe some of the loading screen audio after hitting high lvl cryptarch, the tower itself has some kind of "essence" of being alive. Maybe its where the traveller hides recouping.
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All terrible answers.
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Because, technically, we are slaves. Brought back to life to fight the Darkness. We are only good for killing, and dying.
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Because they are zombies and the public is scared of them
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It well protected. By the traveler and its wall