Why did John Adams defend the British soldiers involved in the Boston massacre

Adams’s exact motivations are not known. He clearly knew that taking on this case was dangerous. An angry mob could threaten his family, and should his reputation be tarnished, his ambitions and economic future would be endangered. On the other hand, Adams strongly believed that the men were entitled to a fair trial and thought that history might view him as a man who put principle above his personal beliefs. One historian, Hiller B. Zobel, has suggested that Adams agreed to defend the soldiers in exchange for a legislative seat. (Three months after the trial, he was Boston's first choice for the position.)