system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar: LOK] Why did Unaloq bother occupying the southern water tribe?

It seems to me like his plans would have gone off without a hitch if he'd just left the southern tribe alone, Korra would never have suspected anything and would have opened the northern gate for him. Would the two tribes being united make any difference once he ushers in 10,000 years of darkness?
gpt
Unaloq seemed, at times, to believe he was going to become something analogous to the light Avatar, a human person in full control of his senses and simply backed up by the spirit of dark and chaos fused into his soul.  The plan was not (just) to become a gigantic monster and fire lasers at Republic City, he wanted mankind to survive and be enslaved under his rule.

To that end, conquering the southern water tribe was just getting a head start on his conquest of the entire world.