Your multiple replies on this page stating the same information remind me, as much as it would be cool and interesting for UFOs to be alien spacecraft, many in the pro-UFO community come off sounding a little obsessed and some come off sounding downright nutty. If there is so much 'real' evidence, it would have spoken for itself by now. The same goes for other supernatural occurrences (ghosts etc). Mulder's famous poster said it best - "I want to believe".
I ask you to think, for just a moment, how your outlook would change if you were to witness something that's not readily explainable.
I suspect that his passion on the issue was inspired by an experience. I have known a couple of people who saw things that defy explanation and you pretty much can't make them shut up about it.
I'm not screaming ERRMUHGERD ALIENS! I'm just saying that many people see things that defy the mundane explanations of passenger aircraft, birds, swamp gas and the planet Venus. It's perfectly normal for someone who has had such an experience to be interested in the subject matter.
To quote Donald Rumsfeld, "Absence of evidence is not evidence of absence".
I consider myself to be an open-minded skeptic.
I'm in the "Hey Stan, did you find that proof yet? No. OK. I'll be over here, let me know if you find it" camp.
I think it's far more likely for me to have a hallucination than to be witnessing some supernatural events. For example, many 'ghost' sightings are in houses with higher than usual levels of carbon monoxide.