Answer:
Because they never experienced the violence.
Explanation:
I'm not sure if this is the answer but I think it was because they never experienced the violence that they were giving people. Sorry if this doesn't make sense but I tried. :)
The Mycenaean civilization during the dark age became a time of destruction. There were invasions,earthquakes and famine (little food). With the collapse of this civilization and sudden disappearance of writing evidence we have little knowledge as to what really happened during the dark ages.