I think the article agrees with you regarding violence performed by individuals whatever there political viewpoint.The Statist violence historically performed due to leftist philosophy is another matter.I don't believe that simply stating abortion is immoral inspires violence like folks on the left have accused. This is from the last section of the article....
" Now we come to the crux of the matter: If rightist rhetoric can inspire others to violence just like the leftist variety, what determines culpability? Well, we must ask the only relevant question about that rhetoric:
Is it the Truth?
Sure, you may warn that a new resident in the neighborhood did time in prison for child molestation, and an angry mob may kill him. But did you do wrong? On the other hand, it's a different matter entirely if harm befalls someone after you wrongly and maliciously label him a child molester.
Thus, anytime you sound an alarm -- whether it contains the ring of Truth or that of lies -- it can serve as a call to violent action for some. But what should we do? Create a Fahrenheit 451 situation in which ideas are roundly suppressed and people are kept comfortably numb? No one wants that, and it wouldn't work anyway.
At the end of the day, one who speaks the Truth may inspire violence against livers of lies just as one who speaks lies may inspire violence against the tellers of Truth. But this isn't the fault of the Truth; it simply means that society needs more of it.
So the moral of this story is that we all can inspire violence with words, but not all of us speak inspired words. Evil may be done in the name of good or evil, but it is only those who speak the latter who have blood on their hands. "