alien existence

I love the news blips on the homepage of Yahoo! There are usually 32-40 of them and they can be scrolled through at four at a time. They range from funny to serious, heartwarming to information, and some are just pure strange. Strange is the word for the blip that caught my eye today.
The title on the blip spot was "Scientist: ET go home". My first thought was are they finally admitting to area 54? Aliens are already here! Since the only movies I find to be scary, and to give me nightmares, are alien movies (watch Fire in the Sky it is based on a true story) I was quite intrigued. When I clicked on the link the actual title of the article was "Aliens may exist but contact would hurt humans: Hawkings" I have to say it was no where near what I expected.
The article basically said that we should not want to make alien contact because chances are that "the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans" and stated that they would most likely happen upon us as the looked for another planet to live on as they sucked the resources on their planet dry.
I thought to myself, is that not what the human population is doing to the earth? We use and use and consume and consume and there is no way to replace much of the resources we use, eventually we will have sucked this planet dry and I have a feeling that the aliens will have to watch out for us.