From a personal experience shared by family and neighbors I am positive there are aliens visiting the Earth.
I realize by saying that I jeopardize any claim to rationality in the eyes of skeptics. So what. I didn't ask for my experience but I am content with my judgement and the perspective that experience has given me.
I don't believe there are more intelligent beings than humans. That is not a statement that should be labeled as arrogance. Species succeed when they have enough generalized abilities to adapt to a wide range of environments.
Too much individual intelligence becomes non-adaptive. At a certain point extremely high IQ's handicap a person especially in the area of sociability which impedes cooperation.
Most likely advanced civilizations have arrived at that state through cooperative techniques that evolved through trial and error.
If humans could learn to cooperate and get past the fighting betweens males for access to females they could be capable of amazing things. Even god-like things. Through cooperation humans can match the achievements of any other evolved species that may exist.
After all, look at the cooperation that goes on between the specialization of cells in our own bodies. Think about the amazing symbiosis between the bacterial invader we affectionately call "mitochondria"as if they were just another part of our cells. Humans still haven't learned how to fully exploit human resources. If we can learn to cooperate the door will be open to understanding the genetic aspect of individual talents. There will be no need for crude psychological testing to understand a person's ability. There will be no wasting of human talent and potential with the hit or miss random distribution of people to various occupations. Think of the "genius" of all sorts that go to waste in the billions of people that are working at jobs inappropriate to their unique talents. Imagine a society where everyone has a job that fits their capacity.
Unfortunately, this has been given the name of socialism and is scorned by the libertarian freedom fanatics. Libertarians are usually highly intelligent and they need to recognize that they stand to benefit greatly from a society that is focused on discovering and utilizing peoples assets.
Instead earthlings will continue to use the artifact of struggle for reproductive access (war and strife at all levels) until they destroy themselves or are rescued by intervention from our advanced brothers from other planets or multiverses.
Not in our lifetime! So you just have to make do.
