I think a solution to the problem is to have an Ignore function Implemented in the shoutbox. It works in Worms Armageddon so it will work here too. With this ability in reach, we as individuals will have the power to filter out what we consider inappropriate.
People that abuses their freedom of speech for their own selfish gain, usually brings the opposite effect. This situation will help us as a community to sensor people's vanity with mute function, and perhaps even more.
Terrorists usually achieve this by applying fear and inevitable destruction & pain to innocent civilians, ergo freedom of speech is deprived by such inhumane act.
But there are those who will find everything that has transpired so far negligible and thrive on it.