Just like conservatism, the problem is what parts of it you push.
Focus on divisive issues like gun control, open immigration, and hyper inclusion of any possibly marginalized group and you push people away.
Avoid the wedge issues, and focus on things that will make everybody's lives better, like honest government, social safety net, and good health care, and you bring everybody together.
If you look at the entire range of issues, including the ones politicians don't often talk about, you might find that Americans generally agree on more than they disagree on.
But rather than focusing on those shared agreements and trying to build a better country, both parties are focusing on wedge issues where there is strong disagreement.
So far that solution seems to be to ignore it as a problem and continue the policies that created it.
Dems are a little better on unions, but neither one is addressing the systemic problem.