Some rationality from a non racist.
When Straw spoke, I had no reason to doubt him.
Subsequently there has been evidence that it was not just white girls, but nothing to contradict him about BPs.
Why should I not believe he really has had that experience?
No racism.
Then the survey.
Not proof, but certainly evidence.
No reason to dismiss it out of hand.
Ann Cryer said she had the same experience in her constituency.
Again, no reason offered to doubt what she said, and a pattern emerges.
Racist?
Hilary Wilmer. Why should this impeccable woman be doubted, with her hundreds of cases all BPs.
She corroborates all the previous.
Shafiq, Allibhai-Brown and Ahmed tell the same story from BP perspective, and it corroborates all that has gone before.

After all this time, still no convincing evidence of significant non BP involvement.

I find that convincing.
Why would an unprejudiced person refuse to believe any of it?
You don't have to be racist.