Here's the point of the video. Read the constitution. What happened at Kent State and the G20 violated the American citizens rights. the students at the G20 was not even part of the protest . The military was also being used at the G20. It is against the law to use the military to police citizens. The law is called The Posse Comitatus Act . There is no such thing as an unlawful assembly at a Peaceful protest. Its your right to have a peaceful protest! Here is the 1st Amendment rights.
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances" . The events at Kent State and the G2O was Unlawful by the government, Police, and the military. They did NOT have to obay an unlawful order!