The problem is that if they didn't do it, the damage is already done. Nothing will convince our enemies that they didn't do it, and they are already preparing to take full advantage of it. By now the truth is a minor detail.
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Our enemies don't need any additional reasons to hate us. It is those in the middle who will be affected by this. I don't know what if anything happened (and as such I won't comment either way) but I would suggest that if the alleations prove true then that would be a bigger problem.
But is is all bs. It doesn't really change what is going on, unless we let it. The idea that the was is fought in the media is a self-serving myth propogated by the media.