The church is to most people the place where the outside world, with its violence and evil, gets muted, so that the connection with divinity and a better inner self finds its strength. Sometimes, those who are there to facilitate it with calm advice, selflessness and inspiring words, are those who in fact most need them.
Priests have their demons. Pastors have deep and disturbing secrets. Monks can be frustrated. Evil doesn't discriminate, and people have never been immune to their distressed minds, regardless of profession, vocation or convictions. Horrible acts, with pathological explanations stemmed from the disturbed rationale of sick people, is a safe recipe for horror in real life.
"Thou shalt not kill," indeed - but easier preached than done.
(Warning: There are some disturbing images in the following article.)
Catholicism forbids having children outside of marriage, and although Roman Catholic priests are allowed to get married, they can do so only before being consecrated. Christ didn't have children, so those representing Him in the church should therefore not have them either.
It's not hard to understand, then, why having a child (especially outside of wedlock) contradicts everything a reverend stands for, and is most likely career-ending. In the eyes of the law, though, having a child is not a crime - but murdering him is.
Dagoberto Valle Arriaga was a reverend from Texcoco, Mexico, who had a son with a woman he wasn't married to. He concluded that killing him would solve all problems. After kidnapping him from his mother, he murdered the boy close to a town north of Mexico City. The authorities caught up with him, and after a quick trial, sentenced him to 55 years in prison.