Isn't that why we vote?
Not being able to define your interest can be due to lack of education, unwillingness to take part in the political process, etc.
Similarly, we've done a decent job of crushing political machines and corrupt unions... but a poor job of crushing the powerful business interests and anti-the-small-guy forces they (sometimes) effectively opposed. As a friend of mine put it, our system used to feature various kaiju fighting, all of them wrecking cities, but some of them doing so while trying to save us, some while trying to harm us. We eliminated all the kaiju that were working to save us (smashing a city block here and there and eating the occasional fire truck, sure) but didn't do anything about the ones trying to harm us, with predictable results.