>>I was arguing that the event could be considered more than nothing, possibly something like manslaughter due to possibly analogous events being considered as such.
If you're arguing that casework from manslaughter-at-a-distance exists in the United States and that such case work would be applicable to KiwiFarms, I'd disagree with both points. The first point has already been explained. As to the second point, such a case would involve interstate commerce. That's under the purview of the Supreme Court which has already classified what is considered unprotected speech. "Cyberbullying", however it's defined, is not among those designations. Defamation seems to be closest category, but that's not a criminal designation.
Another point to address is that calling for someone's death or suicide is not in itself illegal. Otherwise, plenty of people would be imprisoned over their opinions about Donald Trump. There must be a mens rea and a credible threat or act for the purpose of objectively harming the individual in question. Composing a slanted and abhorrent commentary about said person does not qualify as or is not comparable to setting up the noose or pulling it.