"but what you could enforce in common is this: let’s just agree on how to score the result." Why would this be important? For example, what value would there b

"but what you could enforce in common is this: let’s just agree on how to score the result." Why would this be important? For example, what value would there be in the Right scoring how well the Left succeeded in implemting gun control? Why would you care how well your opposition accomplished a result you oppose? I don't think this would foster commonality.