The biggest trick they pulled off was making you think there are no ET's. When in truth, negative ET's rule over us at the very top. "Highest Classification"
Not only did they pull that off perfectly. They also pounded the idea into our heads that if ET's come, they will come to destroy us.
Now the positive ET's that want to come land and help us cannot help us. The negative ET's control just about every country's leader and media, so that if the angelic positive ET's land [they] will simply claim they are evil and the worlds military under negative ET control will attack them with the sheep cheering it on.