Aaron was indeed unusually vulnerable. This vulnerability does not excuse the prosecutorial overreach which triggered his suicide. This overreach would merely have been devastating and life-altering to a normal person, but for Aaron, it pushed him over the edge.
Consider a hypothetical example. I'm not sure if this ever really happened in the Civil Rights movement (or if it did, that it was reported), but you can imagine that a black man, on the brink of death, was refused care at a "white only" hospital. He dies on the way to the "negro hospital". The public, faced with this stark story, see the deep injustice of it, and clamor for segregation to end and for the resignation of the hospital personnel responsible for the man's death.
Consider a hypothetical example. I'm not sure if this ever really happened in the Civil Rights movement (or if it did, that it was reported), but you can imagine that a black man, on the brink of death, was refused care at a "white only" hospital. He dies on the way to the "negro hospital". The public, faced with this stark story, see the deep injustice of it, and clamor for segregation to end and for the resignation of the hospital personnel responsible for the man's death.