First I believe that everyone should have the right to express there opinion freely, no matter what! This man should be arrrested for assault and vandalism, and made to pay for the coats he marked up.
But I do have to say something, the pentagram doesn’t necessarily mean he is a satanist. The pentagram was the main religious symbol for pagans, which do not worship Satan but worship Mother Earth. Also early Christians wore pentagrams to signify the five senses.