Do you think aliens in ufos have visited Earth? (And all things UFO)

My thoughts on this subject are a bit unorthodox, but bear with me:

We read and see all the time media material about a race of evil alien beings coming to Earth someday to try to take over our planet, whether it is in movies, documentaries, or literature....but what if, in an ironic twist, WE are the evil alien beings?

What I mean by that is this - in all science fiction depictions of aliens, they're supreme intelligent beings, with incredible technology that goes beyond the rules of physics we have come to know. However, when you really sit and think about it, that race of beings were obviously not born with this sort of advanced technology, as they clearly would have had to develop this tech over hundreds or even thousands of years.

So, with that in mind, what if today, what we as humans are, are those alien beings we see in the movies, slowly but surely building and advancing our tech, to the point where we will be able to have interstellar travel? And we all know our species is proven to be VERY territorial and race supremacy driven, and if we need land (or in this case, a planet), we will do what we have to do to conquer it. Whether it is having a savage war, or slowly infiltrating ourselves into a group before shoving them out, humans crave, prey on populations, and take over land and in some cases, its people; it's proven.

200+ years from now, who knows where we'll be tech-wise and who knows what sort of condition our planet will be in?

I don't know, but it all to me sort of adds up and has been a thesis of mine for quite some time.