I read lots of people pedantically justifying depraved acts by citing other depraved acts. While mutual depravity is reinforcing, it does not justify anything. Not only is 'Tu Quoque", a logical fallacy, it is disgusting when used to justify depraved behavior. Equally disgusting are those who argue that a kindness by opponents is either insufficient, or wrong. Such arguments are a pious fraud.
Russia says kills six suspected militants in North Caucasus (Reuters)
from the article: Settler group brings Korans to Palestinians after mosque attack