You can't discount it simply because it is at odds with your worldview. That is actually irrational. We must have an open yet discriminating mind. In this sense, we practice an interdisciplinary approach that utilizes the rational and arational. There are many ways to refute testimony on UFOs or extraterrestrials. The greater question you face is what happens if you don't immediately rush to judgment and let your intuition and subconscious consider these matters without the force of your immediate prejudices or desires about the truth.
Today it can be stated with a high degree of confidence that observed manifestation of UFOs is no longer confined to the modern picture of the world… The historical evidence of the phenomenon allows us to hypothesize that ever since mankind has been co-existing with this extraordinary substance, it has manifested a high level of intelligence and technology. The UFO sightings have become a constant component of human activity and require a serious global study.
Major General Pavel Popovich, Soviet Cosmonaut
Fourth, recall this interview with Paul Hellyer, former Canadian Minister of National Defence. He is the so-called 'highest-ranking believer'. He is the first and only cabinet-level official from a G8 nation to make such claims. He specifically claims that American officials have met with extraterrestrials. He also claims that these extraterrestrials have shared technologies such as lasers, fiber optics, and kevlar. He corroborates Linda Moulton Howe's claims that extraterrestrials are concerned about the human use of atomic weapons. He discusses the existences of short Greys, tall Greys, Nordic blondes, and Praying Mantis beings. He not only had access to relevant reports, but he also has had an encounter of the first kind - namely a vehicle sighting.
Seventh, consider this interview with Steve Boucher. He claims to have had two encounters of the fourth kind, depending on your interpretation. A fourth-kind encounter involves an abduction. His interview is not famous but I find him authentic and clearly affected by the experience. Eighth, recall the testimony of US Air Force Sergeant Jim Penniston regarding an event in the Rendlesham Forest in England. Penniston is not the only person who has shared testimony here but the Rendlesham Forest incident is worth learning about.
For further learning, consider the work of Richard Dolan and Linda Moulton Howe. Greer, Stanton Friedman, and Bruce Maccabee are all key researchers in these matters. Dolan has a truly wild interview with forecaster Clif High; it is admittedly strange. Dan Aykroyd also has an interview with Joe Rogan regarding his own film on the subject. I am also partial to the work of Linda Moulton Howe but it is very strange material. Her more recent work is not for the faint of heart.