Believe in it or not, I remember my mother saying that if it were true aliens have been coming for a very long time and are much more advanced than us so if there was something to worry about it would have happened by now. In other words why worry. Having said this I will also second the idea that this universe is so massive that it would be quite egotistical to think we are the only life in it. I love that there is so much yet to learn.
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