I am not worried. I figure if we are being visited by beings from another planet somewhere, those beings are eons ahead of us in their knowledge and use of science and technology. They would definitely have ability to easily obliterate us should they choose to do so. The fact that they have not done so reassures me that they intend us no harm.My thinking is that eventually, one of these things is going to have Earth in its crosshairs and I doubt we will be ready, willing, or able to stop it.
Meanwhile I doubt we have sufficient science and technology at this point to counter them should they intend us harm.
So why worry?