'Is Islamic History to Blame for Muslims 'Violent Mentality'?
I think most if not all human history is violent. Christian, American, Indonesian, Chinese history it's all violent. Ancient human history is violent too Aztecs, Romans, its full of many wars, suffering, slavery, blood and gore. What does our human history really say about mankind? Regardless of faith, we are violent creatures. It is also not confined to a specific people and their history, like you seem to be suggesting. Atrocities are committed now and in recent history regardless of how advanced or civilized humanity has become, under many different banners and notions such as Imperialism, Maoism but still all pretty violent.
I've lived in Bosnia, seen Srebrenica. You want to see how violent people are, visit these places where men have killed each other just because they were different, the wrong ethnicity or religion. Visit 9/11 towers, visit Rwandan, Cambodian killing fields. They are all a striking reminder and portrait of mankind, irrespective of beliefs.