Dude, it's your own fucking fault that you got banned. You can't just go saying stuff related to anything that could be illegal, especially in a place with no real sense of humor.
What happens when you say you're going to kill someone in real life? You get charged for threatening a murder. I would much rather have nobody injured and dead when the problem can be prevented beforehand.
If you really wanna fuck up Runescape and its fellow noobs, don't talk about it in Runescape!