Log out after you use a public computer.
Make your password hard to guess.
For the record, if you leave your account active and someone else makes a hilarious "I"M SO GAY, LOLOLOLOLOLOL" thread using your username, thats why you've been banned. And no, I'm not likely to go and remove the ban instead of letting the timer run out.
For the record, if you PM me about "X is sending me annoying messages" or "Y has made an alias profile and is making fun of me", I frankly dont care. Take care of your highly mature social interactions yourself.
Little of what I do has any meaning or lasting significance.