Having a scientific mind is not enough. It seems to me that lack of empathy and too much ego are our main problems as a species (amongst others, surely). It seems we can't get past our reptilian brain's knee jerk responses to problems. While these violent, destructive impulses often manifest themselves subtly on a daily basis (name-calling, jealousy, envy, ect), consider that these same impulses are at work on a much larger, more apparent scale (war). Until we are ready to drive to work without cursing out the guy who cut us off, or to talk behind each other's backs, or get jealous of person flirting with our significant other, we are not really ready to embrace peace or non-violence.