Life has existed on Earth for well over 500 million years. For roughly 450 million of those years, that life was dominated by fish, reptiles, amphibians, and for 160 million of those years: dinosaurs.
Think about that for a moment. 450 million years of evolution (or adaptation, or un-intelligent design, whatever) resulted in advanced versions of reptilian hunters and gatherers. And while we can't be sure, it's safe to say that had the dinosaurs continued their reign on Earth, what we would have today is not a world inherited by man, but a world inherited by further-advanced versions of those same reptilian hunters and gatherers.
Which means what? Well, in all likelihood, little or no "intelligent" life as we know it. In other words: no us.
What does this have to do with UFOs?
I've stated this before. While I completely believe in the existence of alien life (seriously, there is absolutely no doubt in my mind that complex organisms are alive and well on countless other planets in the galaxy, never mind the universe), I'm not entirely convinced the Earth has been visited by aliens flying UFOs from across the galaxy.
And why not?
To me, dinosaurs are the natural evolution of things. Advanced reptiles evolved first because, among other things, they are the "easiest" large life forms to evolve. Mammals were evolving concurrently, sure, but didn't dominate our planet's landscape until something "a little extra" lent a hand along the way. That "a little extra" something was a meteor impact that effectively wiped out the reptilian-based world that the Earth once was. Somehow mammals endured and, when all was said and done, took their turn as king of the Earth's mountain.
Primates came along with their prehensile thumbs and their developing problem-solving abilities and, bingo, here I am typing away on a virtual document in a virtual world so you can read a virtual rant on a screen projecting a virtual page.
What does this have to do with dinosaurs?
While I believe that life is out there and is quite abundant, I also believe that life is relatively rare (when discussing the sheer size of the universe). The cosmic variables required for a planet to successfully develop life are far too complicated and far too finicky for life to simply be (as Star Trek would have you believe) in nearly every solar system. In my opinion, this probably means that there are many, many places currently in the universe with what are essentially advanced dinosaurs. Alien civilizations, again in my opinion, are probably extremely few and equally far between.
Now, why would I believe in lots of alien dinosaurs and few alien civilizations?
Because, combined with the small mathematical chance of developing life in the first place, what it took for humanity to develop was another small mathematical chance: the meteor that wiped out the dinosaurs. Make no mistake, we (humanity) are only here because of that meteor. To put it simply, intelligent life as we know it only exists because an external force wiped out the stupid life, giving us a chance. To put it in another way: our civilization only exists because of two mathematical improbabilities.
So, one in a billion for life to show up in the first place, plus one in a billion for civilized life to show up in the second place. That doesn't equal a whole lot of civilized life in the galaxy.
Do I think there are civilizations among the stars? Oh, certainly, but I think only a handful, if any, are significantly more technologically advanced then we are, and I think that most life on other worlds is comprised basically of alien dinosaurs.
One thing's for certain: no one ethereal entity designed all this stuff.