Who cares what science demands. What scientific groups have been spectacularly and continuously funded to go out and find BF? When that occurs then science can demand it.
Saying what science demands is like saying that a 650lb fat guy demands food even though he will never leave his bed to go out and earn the money to pay for it nor go out and physically get the food himself. It must be delivered to him without him ever lifting a finger..
Give me a break. Science can go pound salt. Period.