Final answer:
John Brown's consistent sanity during his trial and execution garnered respect and shifted public opinion, recognizing the need to address southern power and slavery.
Step-by-step explanation:
Since Brown himself did not change after his death, his sanity provides insight into his character and the respect gained posthumously among those who initially criticized him. John Brown's raid was initially met with criticism from the majority of northerners, but his composure during his trial and as he faced execution transformed public opinion. His refusal to plead insanity and his willingness to sacrifice his life to end slavery earned him honor and a form of reverence after his death. James McPherson notes that Brown "understood his martyr role and cultivated it," implying a strategic awareness of the historical impact his actions and demeanor would have. Despite not condoning his methods, people recognized that Brown's steadfastness and comportment raised crucial questions about the pressing issue of southern power and the broader struggle against slavery.