I don't like this aggressive icon either, it make Final Fantasy XIV look really fake and not blend in the atmosphere. Also, I rather know or have people learn which mob aggress and which does not. It take out the fun out exploring. There should be an option to turn this off, so people who want it there can have it and people who doesn't like it can have it turn off. Someone should also post this in Suggestion Thread so the developer can see and look into it.