This is a bipartisan delusion. Let’s play partisan ping-pong:

Liberals are socialists.
Conservatives want to ruin the earth and poison the water.
Liberals are baby-killers.
Conservatives only care about rich CEO fatcats.
Liberals hate America.
Conservatives think the free market smiles on slavery.
Liberals believe all criminals should go free.
Conservatives want to put all black people in jail.
Liberals are godless atheists.
Conservatives want to make everyone handle snakes for Jeebus.

I’m not trotting out the Shades of Gray line of which the morally irresolute are fond; there are issues that require moral rigor, a willingness to say yes and no and right and wrong. But while those issues often cohere along party lines, the people who hold these various positions are often on different sides of political spectrum. And if you think that’s codswaddle, then you’ve never talked to an anti-death penality Republican or a pro-life Democrat. Push comes to shove, people retreat to the comforting bunkers of their party, but outside of an election or a great sweeping national issue, push just usually comes to push. Cliches are fun for screeds, but man does not live or govern or coexist by screed alone.

I hope this is as obvious to you as it seems to me.