> Person says bad things to whip up a mob

This is *extremely* subjective. Unless you specifically call for an illegal action, it's up entirely to the interpreter whether you intend illegal action.

Also, to say that Trump Tweets -> People dying is a ridiculously long leap. Many policy decisions were made that resulted in deaths. For example, not having less violent means of dispersing crowds available on a day when everyone in the country knew there could be riots at the Capitol.