I don't think that's a great standard. For example if I consistently call a group of people subhuman and vermin that should not exist I may not have a call to action but the ideology I'm promoting is pretty clear. It's not unreasonable to hold me accountable when a member of my audience decides to attack an individual from the group I'm dehumanizing. Nor is it unreasonable for a member of that group to sue me.
And again, the grey areas here seem like the kind of thing that a jury is able to decide. Alex wasn't found guilty by executive order from the president.
I think it's entirely unreasonable. Having a horrible opinion is a million miles away from telling people to do horrible things. Prosecuting people for opinions is the literal opposite of what a liberal democracy should be doing.
And again, the grey areas here seem like the kind of thing that a jury is able to decide. Alex wasn't found guilty by executive order from the president.