Since the person who had issued the ban is no longer a moderator, this appeal shall fall in to the hands of the operators.
You seem to understand what you did was wrong, and a bad way to vent anger on a public server. We offer our condolences to your loss, and hope that you may have a much better time here.
Please take the time to read our server rules-- much has changed since your last visit. Also, it would be wise to remove any mods from your client's .jar file that may be used to grant an unfair advantage above others-- with the exception of Optifine.