Cancer is a HUGE issue that mankind would LOVE to completely do away with, yet we seem to be making little headway – as cancer is a TYPE of disease, and NOT the NAME of a disease.
Perhaps all of this poking and prodding is simply the aliens trying to help us accomplish something we’ve been trying to accomplish for years. After all, to an outsider the typical visit to the surgeons office would seem like a creepy UFO abduction type scenario.
And a lot of doctors are KNOWN for having a less than spectacular bedside manner. Perhaps this accounts for the “not nice to humans” thing.