the fossil record also doesn't show obvious transitional life forms that the theory of evolution says should be there. So many scientist just propose stuff as though it were true. In many things, they really don't know alot about what they think they know.
There are three types of people:
those who don't know,
those that don't know they don't know
and those that know they don't know but get paid big bucks to act like they do know.