Sciencesaves,You ask significant questions. Any irrational belief is borne out of fear and fear out of ignorance. Any human being would benefit from giving the questions you pose 'hard' & open-minded consideration, continuously throughout one's life span.I totally concur with your final query. We can, yet why don't we? Acceptance of our ignorance and/or just plain inability to 'know' is a first step, being humble enough to learn-without-end would support overcoming irrational fear and beliefs stemming from. Connecting-to-the-Value-of-Why 2005-2008©