Frankly, saying that you admire a man who is a career criminal and a murderer does not exactly make you look that good. Steph's friends happen to be heroes and crimefighters - people who deserve to be respected and admired.
Let me put it this way then. One of my facetwins is a villain from the Harry Potter stories. I could easily put together a costume and be him. Would I? No. Because there are people from that world here. Because it would cause a panic. Because the man tortured and murdered and caused a great deal of pain and suffering for a lot of people.
It's called tact Enigma.
You do realize that Batman is in fact, already here?