The Wikipedia article on the Insurrection Act includes this: "The [PCA] expresses one of the clearest political traditions in Anglo-American history: that using military power to enforce the civilian law is harmful to both civilian and military interests. The authors of the [PCA] drew upon a melancholy history of military rule for evidence that even the best intentioned use of the Armed Forces to govern the civil population may lead to unfortunate consequences."
When the police start looking and behaving like the military when does that cross the line of becoming the military? In other words, when does militarization of law enforcement begin to stomp on the principles behind the Posse Comitatus Act?
The Posse Comitatus Act makes it illegal to deploy the U.S. military in the United States, and the Insurrection Act governs how the President can deploy troops to put down lawlessness, insurrection and rebellion.
The Navy Department Library on the Posse Comitatus Act: "It reflects an American tradition that bridles at military involvement in civilian affairs."
The Enforcement Acts gave the federal government the ability to enforce the 14th and 15th amendments.
Dave Winer: "The meaning we can take from all death is that the time to love is when we're living."