Was Korra permanently Opening all 3 spirit portals a big mistake because of Koh the face stealer and the scorpion demon?

7 havens takes place in an apocalyptic setting.

What the fuck did Korra do to fuck this up? She had one job.
What the fuck happened? Did Korra permanently Opening 3 spirit portals in Planet Earth a huge mistake due to evil spirits killing humans like Koh the face stealer?