Earlier quoted context omitted.
The day after the shooting, a banner was hung in the West Point cafeteria stating, "Us: 4, Them: 0". America has a non-negligible percent of population who I can only describe as "bloodthirsty for no good reason". They've been here a long time, and remain here today. When we try to discuss the problem, the noise from political side-taking usually overtakes the conversation.
I think things like that are more a result of how information gets disseminated, and how it's framed, than bloodthirst. I'm sure if you took the people that hung that banner and made them hold hand with one of the students as they died, their enthusiasm would quickly fade. The word 'death' is just an abstraction that feels small when you're young, healthy, and haven't had to watch it happen. It's only easy to look at…
Maybe this has a tendency to happen in larger group-think situations. Those bloodthirsty individuals weren't at Kent State, they didn't experience any of this first hand, but they were part of a group that was, on some level, afraid of the students, and hated what they represented. They lashed out based on group-think.
I blame the scale of our politics for this. The federal government should not be able to start a war without a referendum and a super-majority. Instead of real democracy and "power to the people" everything is becoming a federal issue, covered by a couple dozen national media companies, with everyone in a country of 330 million people lining up behind a thousand career politicians and talking heads, funded by the rich and multinational corporations. So much group-think. No less in the 1960s, I assume.