Probably not; some of those who were shot apparently not threatening the soldiers are all. One man was reported to have had his hand in his pockets. The soldier also, apparently, were under order not to fire. Two of the soldiers appeared to be especially culpable. Of one it was said that he "would never miss an opportunity, when he had one, to fire on the inhabitants, and that he had wanted to have an opportunity ever since he landed."
But: The outcome was roughly justice, although the two most culpable soldiers submitted to having their thumbs branded instead of being executed for manslaughter.
Adams' participation in the defense was certainly laudable, but an often-overlooked detail is that patriot Josiah Quincy II was Adam's co-counsel and Quincy's brother, Samuel, led the prosecution. Must have made for some interesting family dinners.
Of course, since we still refer to it as the "Boston Massacre," thanks to John's cousin, Samuel, and to illustrator Paul Revere, shows that the patriots' version won wider currency.