UFOs exist only in the Believers Imagination.

not necessarily,
The simple and unequivocal fact that can be verified today by anyone is the reality of Anomalies, that fundamental truth is independent of any origin or causes for these manifestations.
Camouflage is used extensively in the animal kingdom and some underwater animals had been documented scientifically to be able to morph/shape shift almost instantaneously, exactly as some Anomalies, as for example the "mimic octopus":
https://www.youtube.com/watch?v=t-LTWFnGmeg
In the same way that stars are masked by the sky scattering of visible light in daylight many small objects in the atmosphere are also masked. This masking effect is lower in the infrared portion of the spectrum and even lower in the short radio wave portion, so scanning the sky in the infrared or in the short radio wave(radar) portion of the spectrum is a lot more effective than scanning the sky in visible light. Dual optical systems exploit this fact:http://www.youtube.com/watch?v=O_QAJWYxaY8
Dual optical systems are to anomalies what microscopes are to microorganisms.
From video footage the "best" that we can show is the anomalous character of a given manifestation, to get clear ideas of the nature or origen of Anomalies further comprehensive research is needed that video alone can't provide. Anomalies manifestations are a "local" phenomena and local phenomena usually have local explanations or causes.
Some anomalies respond with bright flashes to direct light signals in daylight or at night showing with that clearly their anomalous character. Some anomalies had responded by morphing into digit shapes correlated to the signals sent to them:
https://www.youtube.com/watch?v=QeAbuBsYP5c
From a scientific point of view the strongest possible evidence for any fact or theory is observational data consistent/recurrent across multiple independent observers supporting it, the reality of anomalies have plenty of that, so this reality is based on very solid scientific grounds, the fact that this reality have not been acknowledged by Official Science is really irrelevant, they will be FORCED to recognize it sooner or latter in the same way that the Church was forced to recognize the heliocentric worldview, their long held incapacity to acknowledge this reality is a clear sign of a core systemic problem even deeper than the one faced by the Church.
Key steps for systematically observing anomalies:
1- Infrared spotting.
2- The use of very high optical magnification able to resolve distant object details.
3- Direct signaling to the anomalies spotted. Anomalies will change behavior and body geometry in response to "smart" signals.
We define Anomaly as any object or manifestation that exhibit "anomalous" properties or indicators.
These are some frequently observed anomalous properties:
1- A flying object with a rigid tether in any direction.
2- Any object with Variable surface "topology": like for example from a "0" to a "5", then that is anomalous.
3- An elongated object that moves without tumbling.
4- Any object that responded to direct signals by flaring.
5- Any object that released secondary objects or split in multiple parts and then these objects/parts continue to move autonomously.
This channel is directed to scientists and people with a real objective approach to reality: People that truly understand the precedence of fresh and consistent observational data over ANY preconceived ideas/theories and even over old data; conditions may change and what is true today not necessarily will be true tomorrow and fresh consistent observational data should reflect these new conditions or phenomena. We reject "reduction-ism" and fully believe that observing reality directly always will provide more actionable insights than cartoon-like "models" of reality ever will