The instigator gets blamed for all of it And the instigator is to blame for all of it. But that doesn't mean that the people who respond aren't also responsible for the damage they cause.

That's how guilt and responsibility work - sharing it out doesn't reduce it. In the same way that "it's not my fault - he made me do it" is a cop out, so is "it's not my fault - they chose to do it." We are responsible for all the foreseeable consequences of our actions.
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A bad post goes to the wrong address. So you take it round to the right address, or stick it back in the postbox.