If a person espoused and encouraged assassination as a means to achieve his political or philosophical goals then it's difficult to see how he could be surprised if he himself were to be assassinated or affected by violence. In a sense that would just be logical cause and effect.

But to my knowledge Kirk never did and 'live by the sword, die by the sword' wouldn't apply here. In fact I can't think of an instance in recent history where this would have applied - the logical implications inherent in such rhetoric are obvious to most people immediately. Even the Russians as a general rule don't murder their exiled former rulers - the new Czar figures he could be next, and wouldn't want to set a precedent.