John, I am taking reference of your post in solved complaint against yourself, you said you warned him many times, also in your "defense" poufpanda said that you warned him loads of times. That does say something.
If you didn't see when he was insulting or using the "N" word and somebody was complaining about it, check console, although that might not work since if he is alive and you are dead you might not see it. Then again if someone is complaining even after you have asked him to stop, take that into consideration, you have the responsibility and as I said I don't care how busy you are, take your time to sort the server out, if you can't, then I don't see why you need admin rights on the server.
Don't forget, you were responsible there. Was there any other admin at that time? If not, full responsibility on you.
Stop making excuses.