Spam is bad, and spamming is bad, but that does not automatically make spammers bad people. It's natural to get emotional about receiving unwanted email, but this should not make you threaten violence to spammers.
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Sometimes,
- explanation and education will do the trick,
but if you have to resort to threatening,
- do it with legal means (by means of the law and sanctions enacted by society, such as a refusal to accept any mail from people and organizations affiliated with spammers).

