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By your logic, Valhala: I post something on my personal (but publically accessible) blog calling, for example, "Emily" a whore, and someone finds out about it and spreads it around... Emily finds out and is offended. She reports it to my boss, who is accountable to his public (which includes Emily), who is ticked that I called her a whore, and I am forced to resign.
Sure, I published this stuff on my own personal blog, which people normally have to go out of their way to find. Sure, my intent was not necessarily to insult Emily to her face. But I did it. It's my responsibility, and the fact that other people were exposed to my insults against Emily does not mitigate the fact that I willingly published this insult on a public space, the viewership of which I have little or no control.
This is such a lamely direct allegory to what happened with Marcotte that all you have to do is insert "Christian" for Emily and you've got the real story. Marcotte is responsible for her words, whether or not she had any idea who might come across them. She should grow up and accept that.