I'm not sure how to respond, or even if I should. Do you believe in aliens that crossed an incredible expanse just to wiggle their digits in our backsides and vandalize farmland?
I believe all things are possible. I also believe the government is more than willing and capable of lying to us.
I also wonder if you only hear the stories about aliens covering vast divides "just to wiggle their digits in our backsides", or if that's all you think about.