I do agree. However, hopefully no one is suggesting soldiers firing M-1s indiscriminately into a crowd of protesters was justified. There is no evidence I could find that any soldieres were injured by rocks. Maybe there were some???

Protesters began to move back from the guardsmen and up a steep hill known as Blanket Hill, coming down onto a parking lot and a practice football field on the other side, archives say. Guardsmen followed the students onto the field and endured shouting and rock throwing for about 10 minutes, reportedly feeling trapped by the field's fencing.

The guardsmen subsequently retraced their steps back up Blanket Hill and once they got to the top, 28 guardsmen turned and fired towards the crowd.

Many of the guardsmen pointed their guns toward the ground or fired in the air, but it was reported that a few fired 60 to 67 shots into the crowd during a period of 13 seconds.

May 4 Kent State shootings happened 55 years ago. Look back in history

Here is the most fair/accurate review I could find:

The May 4 Shootings at Kent State University: The Search for Historical Accuracy | Kent State University