Trust me, we do know. There are a lot of religious leaders and followers who behave the very same people they "rail" against. We speak about it at Church a lot and speak of it a lot. I've heard sermons about it. It represents those who go to Church yet practice a lot of the things that Jesus commanded us not to do and those who "go through the motions" . I don't use the term "pharisee", I use the the term "religious leaders". I am not sure why people don't realize this.
As for the OP, I don't rail against anyone's religious icons, myself. To me, they may not be icons, but to those who follow that religion, it means something very important. I try very hard to treat people as I would like to be treated.