Mystery writers walk into a room for the first time and consider where we could most efficiently kill somebody in an interesting way. We discuss untraceable poisons in restaurants-and terrify the poor people who wait on us. We wonder whether the beam that runs across the ceiling in church would hold up a hanging corpse, and how long a dagger would have to be to puncture a heart.
We are essentially peaceful. We can always bump off unpleasant people in our writing. No reason to do it in actuality.
So don't blame the blameless landmarks we've used.
Remember, it's all fiction...