"All black people have higher fast twitch, then why are they also dominate in distance runs, no mention of how any of the traits effect sprinting times at all except for their opinions."
No one said "all black people." And the black people with high percentages of fast twitch fibers are those from WEST AFRICA (most African Americans today are descended from West Africa—that is where slaves came from). That is why WEST AFRICANS dominate sprints. EAST AFRICANS (who dominate distance races) are the opposite. They have more slow twitch fibers which give them more endurance rather than power and explosiveness.
This is pretty basic stuff dude.