Most credible UFO sightings which leave behind evidence (i.e. Radar evidence, physical traces, or credible eyewitness reports) are likely government tech.
Abductees are likely experiencing inter-dimensional demonic incursion. The "Aliens" that abductees claim to interact with are the literal sliding shills of the cosmos pretending they are something they are not. It all parallels spiritual experience.
Just an anon's opinion who has been through a lot with these critters.