You obviously don't really understand libertarianism. The government should stay out of people's personal lives. Yes. But what you fail to understand is that your liberties quickly deteriorate when they encroach on other people's liberties. Harassment isn't a PERSONAL right. That's just stupid to even think that anyone's political belief would be OK with harassment.
And secondly, they weren't arrested for the Facebook posts specifically. They were already building a case based off of their harassment while the other girl was alive. This was simply more evidence that they were a liability to society because the Facebook post showed an obvious lack of remorse for being indirectly responsible for a suicide.
I'm not surprised you posted this as anonymous. Just a ridiculous post.