It's not the antithesis to freedom of speech. People should be allowed to say whatever they want. Whether that is good or bad. You can certainly think that they are a douche but they shouldn't be fined for being a douchebag. No actual harm was caused by this dickhead. If he had made death threats or something then sure. But him being a troll does not warrant a fine and a reduction in free speech.
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How is an arrest/imprisonment considered violent?