Hi LogicFail,
All good points until you make the comment, "Yet folks continue to jump from the first possible explanation to the most extreme "solution" without out stopping anywhere in between."
I've been interested in ufology since I was a child and talked with hundreds of people, many of them witnesses. None of them have simply jumped to the conclusion that what they saw was some kind of alien craft. In fact, most had a hard time accepting that what they saw could have been an alien craft even if that explanation seemed to fit. Typically, if the object was something odd, they will say something like, "I don't know what it was".
In two cases, the witness saw the object clearly in daylight within a few hundred yards, but even these people had to be asked outright where they think it came from. Up to that point they simply called it a "thing" or described it as a "flying saucer thing ... you know ... a UFO".
So in reality, the notion that everyone who isn't some kind of indoctrinated skeptic jumps to the conclusion that all mysterious flying objects are UFOs ( alien craft ), seems to be an opinion propogated by the skeptics; perhaps to prop up the image that anyone who believes in UFOs is irrational and impulsive. That idea is simply untrue.
Lastly, as for all the reasons the skeptics give as to why alien visitation is improbable: There is no scientific reason why alien visitation isn't possible, and we don't know all the variables to be able to make an accurate assessment of the probabilities. The more we learn, the closer we get to inventing the technology that will make interstellar travel possible for us. Unless civilization comes to an end, I would not bet against interstellar travel becoming a reality by the end of the next century.