A good point...
I think people just sometimes forget that agreement at the central level was easier in the past because it was a given that very few of those decisions would affect individual lives.
The central level is for deciding what the country should do as a country - wars, etc.
States, counties, cities, churches, families and (ultimately and most significantly) selves are for deciding how to run individual lives.
Whereas today the feds not only control every aspect of your daily actions, they are now moving into controlling what you are allowed to believe.
So we are now condemned to campaigns which continually promise to reverse everything each four year cycle.
God created diversity. Man is mucking it up - as usual.