Final answer:
Joseph White was the only one to go to trial for Helen Wilson's murder due to the complex legal situation and issues in the justice system, influenced by racial tensions and societal factors.
Step-by-step explanation:
Joseph White was the only defendant to go to trial in the case of Helen Wilson's murder because, although several individuals were initially implicated and suspected in the crime, circumstances surrounding the trials and legal procedures of the time period led to a very complicated and injustice-prone legal situation. It is not explicitly clear from the information provided why White was the only one to face trial but factors such as white-majority juries, racial tensions, and potentially flawed legal proceedings, including police identification procedures, could have contributed to the unique outcome of White being singled out for trial. The historical context indicated by the other provided excerpts demonstrates overarching issues in the justice system at the time, where racial prejudices and societal influences heavily impacted legal outcomes, rather than an objective evaluation of the evidence.