I would stick to my position if it escalated to violence. The best strategy to counter terrorism is not to give up freedom. Giving up freedom is society acting as if it is terrorized. Acting terrorized is exactly what terrorist want.
Whether he wrote a song, a poem, a joke, a virus infected his computer and posted it, a friend wrote it while he wasn't looking, a hacker got in and wrote it, or any one of a million ways it could have come into existence or be interpreted, the government does not have to right to suppress his speech, set excessive bail, and seize his person. That is why we have the 1st, 4th, and 8th amendments. If all speech was happy-go-lucky speech, it wouldn't need to be protected.
I would rather die in a terrorist attack, then live without liberty. Look up the number of deaths caused by smoking, cars, alcohol, and obesity and then compare them to the deaths from terrorist. Then explain to my why we can't risk having a kid express himself. When did we become the land of the oppressed and the home of those scared by words?
"Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety." Really think about that. Think about what it means, why it was said, what the logic is behind it, what the philosophy is behind it. Say it over and over to yourself. Say it to friends and family. Memorize it. Live by it. It is the quintessential wisdom for our time, and for all time.