Nor did I intend to offend anyone..
To assume that there is life in the universe other than ours is a what I consider a classic mistake in logic. When we make that assumption using the old addage that the universe is so large that the odds are life has to exist elswhere, we are thinking incorrectly. Here is why...
We are basing that notion on pure chance. It is like saying if you play cards long enough you will sooner or later draw a royal straight flush. That statement is surely true because we can calculate the odds of that occurance. These odds can be calculated because in the question of cards we are dealing with known paramiters.
However when dealing with the universe we are dealing with an entirely unknown situation. We simply do not know the odds for or against life existing on any other world but earth. For all we know life may be unique to this planet.
Another reason I don't buy the "there is so much space there has to be other life" is that that notion procludes any outside influence.
Going back to my card analogy for a moment. Suppose I was the dealer and I had fixed the deck so that there was no way you could ever get a royal straight flush. You could play endlessly and never get the hand. You might begin to state the odds are in your favor of gettin the flush, but because of an outside influence (the dealer) you would never get the flush.
Supposing the existance of a supreme being ie God, and suppose God made this universe just for us than we would never find life because He decided at creation that we were all there would be. Again since we do not know the mind of God, we do not know if there is life out there.
As far as the different beings, craft etc factors I mentioned I suppose you have some merrit to your points, but not that I think that the great number of different types reported weights against the assumption of the sitings being from another world.
If these creatures were form another world or worlds why do you suppose they would be friendly? Advancement does not in any way make a people morally supperior to another. In fact history has proven just the oppisite. If indeed these creatures are from another world, I don't believe for a moment they would be friendly.
That being said, I do not believe the sitings are visitors from other planets. There is something else happening here. Perhaps something beyond our comprehension....