The Right has weaponized propaganda. They are extremely effective had taking any perceived weakness in their opponent, and blowing it out of proportion that even non-Right leading voters believe their new talking point is a real problem.
The landscape of politics has changed. Until we can get back to normal philosophical difference between adults, we can not let the Dems implode in inner fighting, as they are known to do.
I wholly reject your argument. There is a time and place for your idealistic model. This is not it. This country is hanging on by a thread, and the GOP is actively trying to cut it.
Edit - you downvoters are acting like we didn't just get Trump in 2016 largely because of infighting in the Left that disenfranchised voters. And we'll be paying the consequences for a generation because of it.
To many idealists here that can't see the forest for the trees.