Was it "far worse" as you state? Four people died at Kent but two at Jackson. In terms of the number of human lives lost, Kent was worse.
The Jackson dead were not "machine-gunned", they were killed by buckshot from shotguns.
The dead were not killed "in their dormitories" but were two men who were part of a crowd gathered in front of a women's dormitory on campus.
These two were not killed by a "guard unit" but were killed before the National Guard arrived at Jackson State - the only authorities on the scene at the time were the Jackson Police, the Jackson Fire Department and the MS State Police.
Because there was no Guard presence at the time, you are trivially right to say there was no attack on the Guard. But at Jackson State the crowd set fires, turned over vehicles and set vehicles on fire - and then threw rocks and garbage at the firemen who responded.
If the Jackson State students acted as you indicate and were so acting when shot (as were the Kent State punks), then marksmanship awards for the shooters there. If you are correct, then Jackson State was worse because of the lesser body count.
1. There is no incontrovertible right to revolution without consequences.
2. The government has the right, indeed the responsibility, to thwart revolutions.
3. Those who revolt and lose are generally dead when it is over. The Brits would have hanged George Washington, Ben Franklin, John Adams, Alexander Hamilton, Thomas Jefferson if the Brits had prevailed. Our revolution of 1776 was won and they were not hanged.
4. At various points in American history: Haymarket Square riots, "Bonus Army" encampments in DC disbursed and dispatched by MacArthur and Patton, Kent State (for three examples), Marxist punks rebelled and were killed. Kent State was a very low efficiency response under the circumstances.
In any event, whatever happened at Jackson State does not excuse the rebellious and treasonous criminal punks at Kent State.