At one point I was talking about the disgust and contamination psychology discussed in my book Unclean. I was talking about proximity and contact attributions in judgments of contamination, how we become contaminated by making contact with a polluting object.
And in the midst of that discussion I told the students how on Sunday I had been asked to lead a prayer for ISIS at a prayer vigil for the Syrian refugee crisis. I noted how that prayer would likely contaminate me in the eyes of some. By praying for ISIS I make contact with them and, thus, become contaminated. That was the worry I had in leading the prayer, that it would contaminate me in the eyes of people.
That's the scandal of praying for enemies, I said to the OC students, the contamination of prayer.