What he is saying is that it looks like we are explaining the unknown based on our greatest fears - coming to a conclusion and then finding evidence to support

What he is saying is that it looks like we are explaining the unknown based on our greatest fears - coming to a conclusion and then finding evidence to support it - rather than by looking at the evidence. It doesn't mean the conclusion is wrong, just that it is always worth remembering how our ability to analyze data points is always done through a haze of our own experiences.