Answer this question the british rule. do not say anything about "it's too blurry" .
and also don't answer it out of nonscence just for points or so.

The author's purpose (to me) is to showing the terror that the British were causing during and after the Boston Massacre. He/She was trying to connect you with the feelings of confusion and the feeling of control. (This is my opinion, it may not be correct but it is what I feel the author's point is.)

The one that considered as a direct result of the presidential committee on civil rights’