I hear what you're saying yet I have to disagree that we only
   need one idea that everyone will adopt. I don't think that's
   possible. Look at us. Two, now three people discussing something
   in a comment on a post I made. We're all slightly agreeing and
   slightly disagreeing with each other. The distinctions between
   ideologies is often very fine grained as much as there are
   vastly different ones. But the fine-grained distinctions can
   become amplified in lieu of large differences and the ideology
   wars will continue. In each of the ideologies there's generally
   one similar notion: "If only everybody would agree with us, the
   world would be better". I see that very outlook as an issue, a
   causal point. I try to see alternatives to diplomacy and
   civility as answers but it's hard for me to find any that seem
   to work better than that. Yet, that's my ideology. I'm doing the
   very same thing.