If aliens do visit Earth you'd have to think they would do more than pose for ambiguous photos and make patterns in crops.
Alien One: "So... what shall we do with this expensive and hi-tech spaceship?"
Alien Two: "Dude, we could go over to that planet with the hairless apes and like totally mess with their crops, it's only a few hundred light-years away. They'd be all 'Whoa! Where did that big circle come from?'."
Alien One: "Man, that would be sweet."
There was actually an interesting documentary on this a few months back, a British special effects team who make all kinds of things for movies were asked to come up with a convincing-looking UFO and use it to trick people. They successfully built one that was about the length of two cars and had it fly over a village just as everyone was coming out of the pubs, and dozens of people actually saw this shiny silver UFO fly over them. Once it had been reported a camera crew was sent in to interview the witnesses and nobody could agree on the shape of the craft or how fast it moved, and estimates of the length ranged from about five feet long to over a hundred. That shows that inconsistencies in eyewitness accounts don't necessarily mean that people are lying, just that they're lousy at judging something up in the sky.
A few people even got footage of it themselves and it was broadcast on several of the national news programmes, none of which took it seriously. It was always preceded by a little bit of joking ("If you thought that news was out of this world then see what you make of this") and usually put in right at the end, where they tend to put silly or amusing stories. This was actual footage of an unidentified flying object seen by dozens of people, it wasn't doctored footage or anything but still nobody took it seriously. So that would be the same if an alien ship actually did visit Earth and was caught on camera, people just aren't going to accept this kind of thing without either mass sightings all around the world or genuine alien contact.
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