Anecdotes and eyewitness accounts are useless. People lie, misremember, embellish and are often mistaken. Our perception of the world is not always accurate, our senses are fallible and our prior beliefs can and do influence and distort what we see and hear and experience.
Grainy photos and videos of distant lights and objects are equally useless and prove nothing. Even a high-quality photo or video of a strange machine or aircraft in the sky must be authenticated by a reputable and independent source and even if it isn’t fake, it must be proven that the object isn’t of terrestrial origin, that it isn’t classified military technology or whatever. For that one would need complete access to every piece of classified information of every military complex in the world or direct and unlimited access to the aircraft so that a thorough examination may be done.
A photo or a video, even if authentic and of high quality, doesn’t prove anything. Much more is needed.
What reason is there to believe that aliens, if they exist, are technologically advanced and have the resources and desire to visit our planet?