Trying to get you shut down is not infringement, IMO. Actually getting you shut down is more complicated, as I've tryed to type my response 4-5 times now and I don't feel I can convey my thoughts well enough via post.
That's OK. This isn't one of those threads where I can win with some better logic or morality.
My gut says that the more force you exert against my fictional site and its terrible watermelon hating message that a line is crossed from expressing an opposing view to trying to eradicate my message.
If infringement isn't the right word as Freedom of Speech may not be used correctly, it is still pushing the boundary of wrongness.
A better example might be that guy in the news again who wants to burn some books that other people strenuously object to.
Is he hurting anybody? Not in any physical or financial way (though he might be causing pollution). The emotional harm is mostly because some people choose to put value on the books of a specific title.
Is it a good thing to burn the books? Not really. He's deliberately trying to insult people.
Does he have a right to burn books he owns (barring the pollution issue)? I think so, and apparently others begrudgingly agree.
Is it right to try to stop him? I don't think so.
Any form of intimidation, coercion or persuasion to stop him is interfering with his free will and free action.
Does somebody have to right to be accidentally insulting (ex. PA's initial comic)?
Does somebody have the right to be deliberately insulting (ex PA's t-shirt, or this book burny guy)?
Do you have the right to try to stop a deliberate insult?
I think we get a collision when my will is in conflict with your will.
Why does your will get to override mine?
Are there conditions on when that is OK?