Point being — If you realize that all is interconnected, that we are all God’s children, all part of Indra’s Net, all offspring of Iluvatar’s thought, or however your cultural flavor of religion prefers to call it, Aliens aren’t that worrisome.
On the other hand, if you view aliens as truly *other* than us, and believe you are “a stranger and afraid in a world I never made” already, that is quite worrisome and thrilling indeed.