Don't feel as though you have to :D
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Well, yes. And no. If violence is already a part of life then one doesn't actually need to be seen to encourage it while very much encouraging it indeed. Like Tony Blair wearing his anti-War/CND credentials (metaphorically) while launching Iraqi Freedom.
Maybe the important thing is that you don't actually condone violence.
No, cowardice is unfair. I doubt you, or any of us, have had the environmental upbringing and education that would prompt us to automatically conclude that these crimes demand to be be seen through the prism of the current interpretation of the ethnicity, culture and religion of their perpetrators.
Rules are only useful if everyone agrees to, and accepts, them before the game begins. After the fact is no good.