That would be the equivalent of flying Sidney, Australia to Los Angeles, landing at the airport, and crashing 10 feet away from the gate. Perhaps it is assumed

That would be the equivalent of flying Sidney, Australia to Los Angeles, landing at the airport, and crashing 10 feet away from the gate. Perhaps it is assumed most people won't think about these questions and just accept the FUD fear uncertainty and doubt? Often crashing around military sites would suggest to me a way to cover up failed prototype craft that are being demonstrated to potential buyers. Also, can't they wear clothes ? Looks like the only aliens we have here on Earth are little greens or little grays, but one thing in common: always naked. Psychological effect perhaps? Fear makes people talk about a thing. I don't know why this would be done given this would not be useful for getting space defense funding. We barely spend anything on watching for dangerous asteroids and that is not even a theoretical risk. Maybe it's as simple as distracting from current events? I would expect visitors to be in space suits that double as armor to protect from the risk of not being accepted and to allow for acclimation to or isolation from our atmosphere. The carvings all around the world on megaliths suggest that previous visitors wore space suits that had pseudo-wings and tanks but maybe they were just smoking some funny stuff or perhaps those were not aliens but just our own advanced civilization that mostly destroyed itself.