I believe aliens exist, somewhere in the universe. Statistically it seems inevitable, I just don't believe they've visited earth or even know we exist, just like we don't know they exist. You can sit on something like that, there would be much better evidence than grainy fake looking videos and second hand accounts.
Earth is a very early stable planet, I'm sure there will be lots more species in the coming billions of years. We might even be the most advanced civilization in the galaxy. But we'll probably never contact anyone else, best we do is notice signs of life on a distant planet.
Either of the right two, it's gotta cover your bits.