Between 50 A.D. and 800 A.D., the Christian faith spread through Europe. The continent had previously been dominated by various systems of polytheistic paganism. The new faith did not immediately erase all traces of the earlier belief system. On the contrary, we can see "split personality" in European culture.
Consider Beowulf: this story reflects much of the blood-thirstiness and lack of regard for human lift which was the culture of Norse mythology - yet, at the same time, traces of the Christian virtues of humility and helping other humans are found. So the characters evince simultaneously desires for blood-revenge and a selfless altruism: a truly mixed lot!
Likewise, the ideology of "courtly love" (which may be only a literary idea, and never carried out in real life) contains both traces of Christian pacifistic concepts, and traces of the pagan "warrior-cult" mentality.
The German folktale known as the "Nibelungenlied" was re-written in the 1200's to include references to Christian concepts of self-sacrifice to aid others, yet its main plot is one of pagan revenge and power-seeking.
When reading European literature, it is necessary to unravel the tangled strands of paganism and Christianity which mingled to yield characters who act in seemingly inconsistent ways: these individuals seem, at one moment, to be vicious polytheists - at the next moment, they appear to have the Christian ideal of respect for human life.