That might be your personal opinion, but it's not the law. If nutjob A makes a defamatory statement about you, but doesn't tell anyone to do anything, and then nutjob B harasses you after hearing what nutjob A said, nutjob B is the one who is legally responsible for the harassment. Nutjob A is responsible for the defamation, but not for what other nutjobs might decide to do.
Now if nutjob A explicitly said things along the lines of "you should go after this person", instead of just making defamatory false factual claims about them, that would be different. But I have not seen any claims by the plaintiffs that Jones said anything like that. They're just saying he made defamatory false statements.
> If an outcome is statistically predictable there doesn't have to be a direct nexxus, a proximate one is sufficient.
This legal theory is a recipe for disaster. There's a reason why the law requires direct evidence for things like this.