On the nature of defiance
When a thug or a bully or a terrorist is threatening you to stop you doing something they don’t like, not doing it is not defying them, it is submitting to them. Even if you otherwise would not, to defy them you must do the very thing they are forbidding. You must do it just because they threatened you. If you don’t, they will not be fooled by your high falutin’ excuses. They will know that you did not dare. And so will you.
Publishing worthy articles about free speech, tweeting that you are Charlie, drawing cartoons of pens confronting swords, standing around with your fellow world leaders, these are all worthy gestures of revulsion. None of them are acts of defiance. Defiance would be publishing the cartoons, tweeting the cartoons, drawing Mohammed and standing around with your fellow world leaders holding up the very editions of Charlie Hebdo for which their artists were slain.