"My species has only made contact with humanity twice. The first time was thousands of years ago, when my ancestor visited the planet trying to rescue a scouting party that had gotten lost on earth. What transpired then was so awful that upon their return, they condemned humanity for their brutality; warnings were written in our history books, and the idea of ever making contact again was written off completely. Thus, the second time contact happened--me--it was completely by accident, and I have spent much of my life trying to cover up any traces of my presence on earth." The ice aliens explains all this patiently, but he's short-handing as much as possible. "Does that help explain it?"