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Aside from leaving the seeds of the Sacred Celestial Tree to suitable places for colonization, Cedric also had another reason to roam the solar system.
Learning about the alliance broadened his horizons greatly and introduced him to many races out there. All had their own cultures and histories; all had their purpose in the grand scheme of things.
The Demon Race were labeled as Space Pirates by the Divine Council. Of course, they weren't the only ones.
According to what Cedric knew so far, there were at least 25 alien races that had been tagged as Space Pirates by the alliance; each one was being hunted down by the members and had bounties on their heads.
Humanity just dealt with the Demon Race. And while things went relatively smoothly, it doesn't mean that it's easy. Sure, they won in the end, but there were thousands of sacrifices made for this victory.