The negotiations ended in discord, even though they were brief, the Light Elves also knew they had returned without accomplishing anything.
However, they too wanted to express their stance—some things may lack evidence, but as long as they are spoken, everyone understands what's really going on, and at least the higher-ups can make their own guesses.
The Sea Alliance wasn't just comprised of evil beings; there were plenty of righteous beings as well.
Once such condemnation was exposed, it stirred up considerable antipathy and condemnation. Initially, Fang Jie's Material Trading House business was somewhat impacted, though the effects were not too substantial.
After all, with no alternatives available, many were forced to hold their noses and use their services, even if they disliked doing so.