Final answer:
John Adams, an American patriot, defended the British soldiers in the Boston Massacre trial, resulting in the acquittal of all but two soldiers.
Step-by-step explanation:
The American patriot who defended the British soldiers at the trial of the Boston Massacre was John Adams. Despite being a known patriot and cousin of Sam Adams, John felt it was imperative for the soldiers to have proper legal representation, which reflected the principles of law and justice that he strongly believed in. His decision to defend the soldiers was seen as unpopular at the time, but his commitment to justice led to an outcome where all but two of the British soldiers were acquitted. The two found guilty of manslaughter were given a relatively light sentence of branding on their thumbs.