It just doesn't seem probably to me for such a complex series of events requiring life to occur twice in the same universe. Unless you believe in an impersonal teleology, in which case it is totally plausible. I believe in a personal teleology who hasn't let me know about aliens, but has told me a lot of other stuff in this pretty amazing book, so I assume that means the former assertion is true.
IU think that it is very vain and selfish for us to think that we are the only intelligent life in a galaxy as big as ours is plus the3 next and the next and the next.... you get the picture. I have never seen or experienced a sighting but I believe.
I do believe there is life out there, somewhere. Could be in many different forms on many different planets even within this galaxy. Is it intelligent? Maybe. Have we encountered them? I don't think so. Will we? Might depend on how long we last as a species.
It seems almost impossible that there isn't life out there somewhere. But i do not think that they've visited us here on the Earth, and we probably will never, ever run into them during the entire life-span of humanity, and we probably won't even find evidence of them, especially during our lifetimes.