Matters such as this ought to be horrific by nature to rational human beings.
They're deserving of some careful, sober and contemplative thought before we arm ourselves and consider ourselves prepared to face the potential eventuality of taking a human life.
Fastbolt, Who says they aren't? The thought of accidentally causing harm to an innocent is up there right below allowing my family to be harmed.
Not only does it deserve careful thought and contemplation but also as much training and education as one can afford.