It could be the Red Coats because they were mad at the colonist for wanting a revolution from King George, and the Red coats are loyal supporters of the King and wanted to get even from trying to overrule the king and have freedom from King George's rule.
The Boston massacre was at least partly the result of the tension caused by the British military presence in Boston. The reinforcements were sent by the parliament to back the Britain’s last attempt to raise the tax burden on American colonies the tax policy in question was called the towns act of 1767
