It isn’t clear if UAPs are the product of human or non-human technology. It is only by their shape and fantastic alien flight characteristics that a non-human origin can be inferred. Human planes can not make 90° hairpin turns or accelerate from zero to hypersonic speeds in the fraction of a second.
Prof. Kevin Knuth, Associate Professor of Physics and Informatics, University at Albany, explained this in his article “Estimating Flight Characteristics of Anomalous Unidentified Aerial Vehicles“.
The majority of the public believes that other intelligent life in the cosmos exists and that we are not the only species inhabiting the Universe. This concept was popularized in the TV show “Cosmos” by exobiologist Carl Sagan and it is held to be true in the general consensus.
People who believe that humanity plays a more special role in the cosmos (anthropocentrists) do think that UFOs come from our own future, instead from alien worlds. They cite the large distances between solar systems as an obstacle for interplanetary spacecraft to make contact.
Some people think that it would be easier to build a time machine than a faster than light spacecraft. Otoh, with a time machine, superluminal flight would be easy. Just slow down the clock dial whilst maintaining forward momentum and viola!, speed is increased.
Superluminal flight implies time travel, according to Einstein’s theory of relativity. Time slows down progressively the more one approaches the speed of light. And should one travel in excess of light speed, then time begins running backwards. That follows from the theory and mathematics of relativity, which does not consider time paradoxes. It’s just numbers.
Professor of anthropology Dr. Michael Paul Masters is one of the proponents of the UFO as time travelers. He explained it in more detail in his book “Identified Flying Objects” calling the time travelling occupants of these craft “extratempestrials”.
I believe that it’s a definitive possibility that some UFOs do come from our own future. Yet the infinity of possible futures in time means that SOME UFOs will also come from other worlds, even if it’s just our mutated time-traveling offspring from thousands of years into the future visiting their ancestral home planet.
If they exist they may be just visiting their ancestral home planet, or their great-great-great-great-great-grandfather. Is there a paradox?
The Contact Initiative (https://reddit.com/r/contactproject) wants to discover if it’s possible to make radio contact with UFOs, to ask them what they are. It’s as simple as that.