''There is nothing sensational about aliens (for a better word)...

''There is nothing sensational about aliens (for a better word) - they have spread their little breadcrumbs throughout history as well as contemporary times.''

The existence of life on other planets has not yet been proven. If and when it does, that would be sensational.

What you call 'bredcrumbs' is not evidence for the existence or presence of aliens on earth, but interpreting things according to the assumption of aliens, where each and every 'breadcrumb' has, as with RH negative, more mundane explanations.