Because unless he's there all the time doing it versus being on the server only 1 time, what's the point of wasting my or another admins time to ban this person? A demo as "convenient" as it is isn't going to get me personally to ban them either. If he's on the server at the time, and is still on the server doing the blocking, then that's when you try to contact an admin and ask for this person to be banned. It's on a view basis. I see it, they are banned. It avoids the "he said she said" bullshit that seems to go in here.