TriciaF, you are right about the immunity of fundamentalists to any kind of logical argument. I think the particularly religious or political tinge of fundamentalism is relatively unimportant and driven more by cultural background, either a desire to belong more or to distance more.
What needs to be understood are the factors that make fundamental beliefs, of any kind, so attractive to some people. I suspect that the factors that drive both Donald Trump and his most fervent followers and the ISIS leader and his acolytes to the extreme simplistic views they hold are inherently not that different.
What do you think would go well with coasters like this?