You really can’t apply rational thought to religious extremists (of any religion). However, my thinking (I am unaffiliated with any religion) is that it is partly symbolic of “if we can do this, we can get to you other ways” as well as fire being taught to christians as the means that god uses to “cleanse sin” from the world, so the cross in conjunction with the fire becomes a threat and means of intimidation.
Latest Answers