We could invite three hundred people to a weekend conference, or maybe... a week long conference.
Hold it at some out of the way hotel where there's no night life or attractions to distract.
Choose these people from a wide variety across our social spectrum, as long as they self identify. Conservative, liberal, progressive, right wing, left wing, socialist, Libertarian.... you get my drift.
Sit them down in mixed groups of fifty. Hand each a list of 100 terms. Labels if you will.
Once they are each done individually defining their terms, then bring it all out for open discussion. The goal is to define the words to a majority agreement. That's it... just define the words. It should be a simple task.
My prediction as to the outcome: Almost everyone will start with a different definition of each term, and there will be a substantial percentage of folks who will flatly refuse any positive connotation towards anyone they feel does not agree with their philosophy. Anyone not them is enemy, and enemy is evil, period.