Ideological leaders (on the left and the right) were responsible for hundreds of millions of deaths in the 20th century, for a start.

More generally, no ideology can actually capture reality. While they all contain some truth, they are all also fundamentally untrue if you drill down far enough. I'd rather grade someone on results (human happiness) than adherence to an ideological framework. I don't mean this in a simple utilitarian sense, either.

I find ideologies in general a huge impediment to solving problems. It erects imaginary barriers around potential solutions. We can all agree that universal health care at an affordable price is a good thing. Whether that is by market based solutions or by single payer doesnt matter to me. Whatever is most efficient and provides the best health outcomes is what matters, not some belief based upon... faith

Ideologies more often exist to build teams/coalitions than to solve real problems.