^Unless, that to exist as the proposed landers, it would be required of them to have advanced enough that such viruses, Etc., are no issue.
Its in my idea that ultimately the universe favors cooperation, at its higher levels, because it, like the global economy, knows it is interconnected. Therefore, humans, with their potential, it would want to cooperate with, possibly. To guide us. This guiding may in fact come through aliens, or other angels, who were/are also guided.
I cannot say that I believe these "transcriptions". I'm not sure if any such landing of a guiding/inspiring race is imminent.