Why do people get so passionate when arguing about aliens?

I can understand Christians being agitated defending the existence of Jesus since many imagine that they have some sort of relationship with this character. But why aliens? Who really cares if they are here or not? What it is going to change if they have visited Earth, never left their home planet, or don't... show more I can understand Christians being agitated defending the existence of Jesus since many imagine that they have some sort of relationship with this character. But why aliens? Who really cares if they are here or not? What it is going to change if they have visited Earth, never left their home planet, or don't exist at all?
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