Given the vastness of the universe, it stands to reason there would be species similar to us and vastly different. There would also be civilizations at all levels of advancement including 100 years ahead of us, 500 years ahead, some at the same stage, and others that are behind us. You can't assume they developed at the same rate nor can we assume they would be benevolent or hostile. We have to keep an open mind. I suspect the truth is truly stranger than fiction.