If you go on insulting, offending, and cursing them, they might conclude that Tick fans are a bunch of maniacal, raging nuisances. This could cause them to lose respect for the Tick's audience and thus, the show itself. On the other hand, courteous messages from fans about the Tick's merits could raise their regard for the program. Tell them a little about why you enjoy the show and feel it deserves to be kept on the air. A short, friendly letter is more likely to be read and taken into consideration than an incredibly detailed term paper-length essay.
Networks are always interested in knowing what demographic groups their shows reach.
You might also mention any friends or family that also enjoy watching the show. E-mail and phone calls are faster, but letters are always best. I'm not sure about networks, but local stations are required by law to keep viewer mail on file. Oh, and you might try writing to or calling your local FOX affiliate, too. It never hurts to send a letter in support of a show you like, even if it's not in danger of cancellation.