Look at it this way: most harmful mutations didn't propagate to the whole species and, since only less than 1% of the species population becomes a fossil, the odds of finding such a fossil are extremely low.
You practically only get fossils from members of the established population.... the ones that got some beneficial mutation.
Here's a nice link to start learning about it: Fossilization processes
You practically only get fossils from members of the established population.... the ones that got some beneficial mutation.
Here's a nice link to start learning about it: Fossilization processes
