I think most people, even those who follow politics, buy into the emotional experience rather than the actual politics. It makes people feel good to listen to a great speech on paying back birth control pills, who cares that it's a really small issue compared to foreign policy or economic policy. The number of real 'political engineers' is really small anyway.

I don't even blame those people. For example I am a car enthusiast but not a car engineer, so while I may love the Porsche brand for the emotional connections it has in my mind, a car engineer who really knows what he's talking about may very well know for a fact that the tech for part X is better in a Toyota. I don't know and I don't care.

People just get disappointed in politicians because they operate in an incentive system that rewards them for not keeping their promises, because votes are a 'sunk revenue' once in office. If laws were made in a private market, they'd be incentivized to be more consistent.