And the unverifiability is part of the point, of course. I'm sure everyone has heard the refrain "that's what the 'U' stands for!". Some people think they have a better grasp of what's behind that 'U' than others.
One thing that's probably fairly certain is that the government has good information on UFOs no matter what they are. If they are nothing substantive, than the government is no better off than we are pretty much by definition (there's not much to know). If UFOs are extraterrestrial or extradimensional or simply a black budget project (or some combination of the above) the government almost certainly knows more than we do. That is the point of the Citizen Hearing on Disclosure, which starts today. Like similar earlier events at the National Press Club, the nice thing about this citizen hearing is that it tries very hard to separate out the level-headed witnesses and researchers from the tin-foil crowd. Emphasis in these things is always on mass-sightings and the observations made by the military, by pilots, and by astronauts. I can't speak for this event - it hasn't happened yet! - but usually efforts like this are extremely careful not to be speculative.
My view is that it's a subject worthy of taking an interest in but unworthy of firm conclusions at this point. I take a casual/amateurish interest in it myself. A few things seem clear:
1. There is a very high probability that the galaxy and the universe is full of life.None of this is clear cut, but to me it adds up to something that a rational person can be reasonably intrigued by.
2. We are at the very cusp of our own space-faring age and relatively rudimentary in our technology (we burn old dinosaur bones and peat moss for God's sake - that's just a step above burning dung).
3. There are a lot of UFO sightings (1,210 reported [not necessarily occurring] in 2013 to date by one record keeper), of course of varying quality. Of course there are a lot of reported abductions too but that's a touchier area. Let's stick with sightings.
4. Governments around the world are clearly keeping files on these events - it is something they are interested in for whatever reason, and
5. There are a few very high profile events - particularly Roswell, New Mexico - with a considerably richer eye-witness record.
If you agree, you might be interested in checking in on the Citizen Hearing this week.