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That's not really how smear campaigns work. Using a very extreme example: if I got 4 people to call you a pedophile, then people will believe it until you submit proof that you're not. The problem is that it's impossible to prove the absence of something, so you're forced to push back on me: "Where's your proof that I'm a pedophile", where I can reply with anecdotes or other useless information. The point is not to "…
True, but in this case it was quite easy to prove the presence of anti-semitism in the Labour party, especially in the far left membership.