Ideologies are a bad way to do politics and policy
A lot of ideologies, particularly extreme ones, rely on a misunderstanding or ignorance to exist
For example, lots of people who are economically illiberal believe that the government has more power than it really has: for example if the government declares the price of eggs or houses to be a certain amount, then everyone will be able to buy eggs and houses at the price specified.
Politics is full of politicians who make exaggerated promises based on the supposed existence of magic money trees: cutting immigration, cutting taxes, taxing the rich, cutting 'wasteful spending' etc.
If you're ideologically in support of these things, then you implicitly believe the magic money tree exists and the reality is that it doesn't.
Tonnes of ideologies rely fundamentally on things that are empirically disprovable with data. Any real world politics has to be informed by real information about what actually exists in the real world, not ideology