End of the day it is down to what people believe!
You can see something and say well yeah that was just a shadow and it be a 99% certain guess. But then someone else could actually see what it was and actually say yeah that was a figure moving.
As for it been a load of bollocks the people who say that dont have any grasp of reality and that life is not black and white, i bet your also that small minded that you believe that this is the only planet that can support life even though nasa have found life on other planet's but that's so way out it's also bollocks.