You bring up a good a point, and it is meant to be provocative on purpose. It really helps remind Christian people of the importance of separation of religion and state when they see Satanic statues next to the ten commandments after they pass legislature requiring display of religious symbols and what not.
It’s one of the only effective ways to get these people to stop trying to push their religion on everyone else. Those types don’t typically listen to reason or compromise with others, for that matter.