I think their symbolism is part of their belief system. I feel like, according to their beliefs, they MUST not keep secrets, and their way of “being public” about their actions is to do it through symbolism as a sort of circumvention of traditional methods of communication. It feels like a kind of “karma” situation to them. If they do something secret and DON’T publicly reveal it in one way or another, it’s bad “jewjew” (see what I did there?) for their so-called souls.