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I understand it this way:
Let's say that the government wants to make it illegal to eat ice cream.
Some people like the idea.
Some people dislike the idea.
But both sides calmly say: We will use violence in order to win. That is, those people who want to make ice cream illegal will use violence to stop ice cream eating; those people who want the right to eat ice cream will use violence in order to have their ice cream.
If it were any other issue (for example: Should the government go to war in country X?), both sides (the YES people and the NO people) would discuss the matter in a reasonable manner before making a decision. They would not go crazy (as they would regarding ice cream eating).