1. The Challenger still would have exploded even if the crew was comprised of seven white men.
2. The Challenger wouldn't have been launched that day if the crew was comprised of seven white men. Nobody would have even paid attention to it as a news story.
It was because of the teacher. One of the other Astronauts was female. There would have been no coverage for the rest of the Astronauts, Still no excuse. They knew it was too cold, They should have waited.