I would've thought that the primary reason for the towers would have been like the old (medieval) guard and watch towers. Even sentry towers, for both the natives and the industrials. Meaning it is basically a keep where they can be garissoned for protection, and can defend it by launching projectiles out of windows, such as burning oil, bullets or bombs.
After seeing the Slig Toss video, where Abe is on the top floor of one such tower, it doesn't exactly strike me as a keep, more of just another random place where mudokons are used a slaves... *shrugs*
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