I read this column and it struck me that two of the five are straight out of the playbook of the American Left, and another is used often by them. That is disturbing.
The boundaries are:
1) I/You vs. I/It.
2) An Ends -Justifies-the-Means Mentality.
3) A Feeling of Victimization.
4) Escalation and Line Crossing.
5) Refusal to Accept Moral Absolutes.
I'm currently listening to an audio book called The Righteous Mind: Why Good People Are Divided By Politics and Religion. Interesting stuff.