"...and the whole thing was a staged event by the organization from the beginning. "
Not that It matters now,
I saw an program on PBS about Civil Rights Era and yes it was staged and Parks was a member of the NAACP. IIRC.
She wasn't just a simple citizen as proclaimed.
The only way for Parks to have staged the bus incident would have been to have deliberately sat in the first row. But in the row she actually sat in she had no idea whether she would be asked to move or not.