[mikeash]

Sometimes it seems like people are more upset about the words of killers than the fact that they go around killing people.

[pyre]

In this case, I think it has more to do with the spreading a message that has recruitment as one of its aims. In the US, the freedom of speech doesn't apply if you are, for example, spreading a message that says, "You all need to kill [ethnic group]."

[wlievens]

I suggest you read up on the effect of the words of killers in Rwanda in 1994.