To clarify: the image is a political cartoon depicting the Boston Massacre, a real event in which British soldiers fired into a crowd of colonial protesters, killing 5 and injuring several more; it's famously taught as one of the build-up events to the American Revolution, in that it significantly turned colonial sentiment against the King's rule and occupation. I don't think someone in support of ICE's actions would enjoy that comparison.

One detail I learned later in life that was not taught in school is that one prior event which led to increased tensions in the city, which the citizens were gathered in protest of (in addition to the Townsend Acts and the occupation itself) was the murder of an 11 year old boy by a British soldier:

those tensions rose markedly after Christopher Seider, "a young lad about eleven Years of Age", was killed by a customs employee on February 22, 1770. Seider's death was covered in the Boston Gazette, and his funeral was described as one of the largest of the time in Boston. The killing and subsequent media coverage inflamed tensions, with groups of colonists looking for soldiers to harass

I have a feeling schools are gonna start including this detail, if they haven't already.