One does not necessarily have to exist to the total dissolution of the other. They could follow the ship all the way to port and protest the coal all the way to the factory and protest outside the factory as much as they wanted, but as soon as they INHIBIT the trade process, they become liable for any costs or consequences (criminal or civil) associated with that inhibition.
I don't think they shouldn't be allowed to protest, just that when protesting creates loss, the protesters should be liable for that loss which would not exist without their interference.
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