My thought is that liberal/conservative does not equate to good/bad, or the other way around. I tend to see it more as a yin/yang situation. Balance being the ideal; each perspective needs things from the other. I think that is likely to be true in general across history, and true in politics at least since the French Revolution.
Polarization is getting us nowhere, and we don't have time for it. We need active, sincere, aggressive problem solving engagement with the crucial (and intertwined) issues of environmental and economic stewardship rapidly threatening our collective future.